JavaScript Alphabetical Reference
| Property/Method | Description | Belongs To |
|---|---|---|
| abs() | Returns the absolute value of x | Math |
| abs() | Returns a Duration with the absolute value of a Duration | Duration |
| accessKey | Sets or returns the accesskey attribute of an element | HTML Element |
| acos() | Returns the arccosine of x in radians | Math |
| acosh() | Returns the hyperbolic arccosine of x | Math |
| activeElement | Returns the currently focused element in the document | HTML Document |
| add() | Returns a Duration with a Duration added | Duration |
| add() | Returns an Instant with a Duration added | Instant |
| add() | Returns a PlainDate with a Duration added | PlainDate |
| add() | Returns a PlainDateTime with a Duration added | PlainDateTime |
| add() | Returns a PlainTime with a Duration added | PlainTime |
| add() | Returns a PlainYearMonth with a Duration added | PlainYearMonth |
| add() | Adds a new element to a det | Set |
| add() | Adds a Duration to a ZonedDateTime | ZonedDateTime |
| add() | Adds one (or more) tokens to a DOMTokenList | DOMTokenList |
| addEventListener() | Attaches an event handler to the document | HTML Document HTML Element |
| adoptNode() | Adopts a node from another document | HTML Document |
| after() | Inserts one or more nodes (elements) or strings after an element | HTML Element |
| alert() | Displays an alert box with a message and an OK button | Window Object |
| all() | Returns a single Promise from a list of promises, when all promises fulfill | Promise |
| allSettled() | Returns a single Promise from a list of promises, when all promises are settled | Promise |
| altKey | Returns whether the "ALT" key was pressed when the mouse event was triggered | MouseEvent KeyboardEvent TouchEvent |
| anchors | Returns a collection of all <a> elements in the document that have a name attribute | HTML Document |
| animationName | Returns the name of the animation | AnimationEvent |
| any() | Returns a single Promise from a list of promises, when any promise fulfills | Promise |
| appCodeName | Returns the code name of the browser | Navigator |
| append() | Appends one or several nodes (element) or strings after the the last child of an element | HTML Element |
| appendChild() | Adds a new child node, to an element, as the last child node | HTML Element |
| applets | Returns a collection of all <applet> elements in the document | HTML Document |
| apply() | Calls a function with a given this value | Function |
| apply() | A trap for the [[Call]] internal method | Proxy |
| apply() | Calls a function with arguments | Reflect |
| appName | Returns the name of the browser | Navigator |
| appVersion | Returns the version information of the browser | Navigator |
| asin() | Returns the arcsine of x, in radians | Math |
| asinh() | Returns the hyperbolic arcsine of x | Math |
| assert() | Writes an error message to the console if the assertion is false | Console |
| assign() | Loads a new document | Window Object |
| assign() | Copies properties from an object(s) to a target object | Objects |
| at() | Returns an indexed element from an array | Array |
| at() | Returns an indexed element from a string | String |
| at() | Returns an indexed element from a typed array | Typed Array |
| addEventlistener() | Attaches an event handler to a window | Window Object |
| addEventListener() | Attaches an event handler to an element | HTML Elements |
| atan() | Returns the arctangent of x as a numeric value between -PI/2 and PI/2 radians | Math |
| atan2() | Returns the arctangent of the quotient of its arguments | Math |
| atanh() | Returns the hyperbolic arctangent of x | Math |
| atob() | Decodes a base-64 encoded string | Window Object |
| attributes | Returns a NamedNodeMap of an element's attributes | HTML Element |
| availHeight | Returns the height of the screen (excluding the Windows Taskbar) | Screen |
| availWidth | Returns the width of the screen (excluding the Windows Taskbar) | Screen |
| back() | Loads the previous URL in the history list | History |
| baseURI | Returns the absolute base URI of a document | HTML Document |
| before() | Inserts nodes (elements) immediately before an element | HTML Element |
| BigInt64Array | Typed array of 64-bit signed integers | Typed Arrays |
| BigUint64Array | Typed array of 64-bit un signed integers | Typed Arrays |
| bind() | Returns a new Function with a specific value of this | Function |
| blur() | Removes focus from an element | HTML Element |
| blur() | Removes focus from a window | Window Object |
| body | Sets or returns the document's body (the <body> element) | HTML Document |
| Boolean() | Returns a Boolean | Boolean |
| break | Exits a switch or a loop | Statements |
| btoa() | Encodes a string in base-64 | Window Object |
| bubbles | Returns whether or not a specific event is a bubbling event | Event |
| button | Returns which mouse button was pressed | MouseEvent |
| buttons | Returns which mouse buttons were pressed | MouseEvent |
| byteLength | Returns the length (in bytes) of a typed array | Typed Array |
| byteOffset | Returns the offset of a typed array from the start of its ArrayBuffer | Typed Array |
| bytesPerElement | Returns the number of bytes used per element in a typed array | Typed Array |
| cancelable | Returns whether or not an event can have its default action prevented | Event |
| call() | Calls a function with a given this value | Function |
| catch() | A callback function to run when a promise is rejected | Promise |
| cause | Sets or Returns the cause of an error | Error |
| cbrt() | Returns the cubic root of x | Math |
| ceil() | Returns x, rounded upwards to the nearest integer | Math |
| changeTouches | Returns a list of all the touch objects whose state changed between the previous touch and this touch | TouchEvent |
| characterSet | Returns the character encoding for the document | HTML Document |
| charAt() | Returns the character at the specified index (position) | String |
| charCode | Returns the Unicode character code of the key that triggered the onkeypress event | KeyboardEvent |
| charCodeAt() | Returns the Unicode of the character at the specified index | String |
| charset | Deprecated. Use characterSet instead. |
HTML Document |
| childElementCount | Returns the number of child elements an element has | HTML Element |
| childNodes | Returns a collection of an element's child nodes (including text and comment nodes) | HTML Element |
| children | Returns a collection of an element's child element (excluding text and comment nodes) | HTML Element |
| classList | Returns the class name(s) of an element | HTML Element |
| class | Declares a class | Statements |
| className | Sets or returns the value of the class attribute of an element | HTML Element |
| clear() | Clears the console | Console |
| clear() | Clears (removes) all storage objects for this domain | API Storage |
| clear() | Clears (removes) all elements from a map | Maps |
| clear() | Clears (removes) all elements from a set | Set |
| clearInterval() | Clears a timer set with setInterval() | Window Object |
| clearTimeout() | Clears a timer set with setTimeout() | Window Object |
| clearWatch() | Unregister location/error monitoring handlers previously installed using Geolocation.watchPosition() | Geolocation |
| click() | Simulates a mouse-click on an element | HTML Element |
| clientHeight | Returns the height of an element, including padding | HTML Element |
| clientLeft | Returns the width of the left border of an element | HTML Element |
| clientTop | Returns the width of the top border of an element | HTML Element |
| clientWidth | Returns the width of an element, including padding | HTML Element |
| clientX | Returns the horizontal coordinate of the mouse pointer, relative to the current window, when the mouse event was triggered | MouseEvent TouchEvent |
| clientY | Returns the vertical coordinate of the mouse pointer, relative to the current window, when the mouse event was triggered | MouseEvent TouchEvent |
| clipboardData | Returns an object containing the data affected by the clipboard operation | ClipboardData |
| cloneNode() | Creates a copy of a node, and returns the clone | HTML Element |
| closed | Returns a boolean value indicating whether a window has been closed or not | Window Object |
| close() | Closes a document | HTML Document |
| close() | Closes a window | Window Object |
| closest() | Searches up the DOM tree for the closest element which matches a specified CSS selector | HTML Element |
| clz32(x) | Returns the number of leading zeros in a 32-bit binary representation of x | Math |
| code | Returns the code of the key that triggered the event | KeyboardEvent |
| codePointAt() | Returns the Unicode value at an index (position) in a string | String |
| colorDepth | Returns the bit depth of the color palette for displaying images | Screen |
| compare DocumentPosition() |
Compares the document position of two elements | HTML Element |
| compare() | Returns -1, 0, or 1 if a Duration is less than, equal, or grater than another | Duration |
| compare() | Returns -1, 0, or 1 if an Instant is before, equal, or later than another | Instant |
| compare() | Returns -1, 0, or 1 if a PlainDate is before, equal, or later than another | PlainDate |
| compare() | Returns -1, 0, or 1 if a PlainDateTime is before, equal, or later than another | PlainDateTime |
| compare() | Returns -1, 0, or 1 if a PlainTime is before, equal, or later than another | PlainTime |
| compare() | Returns -1, 0, or 1 if a PlainYearMonth is before, equal, or later than another | PlainYearMonth |
| compare() | Returns -1, 0, or 1 if a ZonedDateTime is before, equal, or later than another | ZonedDateTime |
| compile() | Deprecated. Compiles a regular expression | RegExp |
| composed | Returns whether the event is composed or not | Event |
| concat() | Returns two or more joined arrays | Array |
| concat() | Returns two or more joined strings | String |
| confirm() | Displays a dialog box with a message and an OK and a Cancel button | Window Object |
| const | Declares a variable with a constant value | Statements |
| construct() | Traps the new operator | Proxy |
| construct() | Constructs a new object (acts like the new operator) | Reflect |
| constructor() | Creates and initialize objects created within a class | Array Classes |
| constructor | Returns the function that created the Array prototype | Array |
| constructor | Returns the function that created the Boolean prototype | Boolean |
| constructor | Returns the function that created the Date prototype | Date |
| constructor | Returns the function that created the Number prototype | Number |
| constructor | Returns the function that created the Object prototype | Object |
| constructor | Returns the function that created the RegExp prototype | RegExp |
| constructor | Returns the function that created the String prototype | String |
| contains() | Returns true if a node is a descendant of a node | HTML Element |
| contains() | true if a DOMTokenList contains a class | HTML DOMTokenList |
| contentEditable | Sets or returns whether the content of an element is editable or not | HTML Element |
| continue | Breaks one iteration (in the loop) if a specified condition occurs, and continues with the next iteration in the loop | Statements |
| console | Returns a reference to the Console object | Window Object |
| cookie | Returns all name/value pairs of cookies in the document | HTML Document |
| cookieEnabled | Determines whether cookies are enabled in the browser | Navigator |
| coordinates | Returns the position and altitude of the device on Earth | Geolocation |
| copyWithin() | Copies array elements to another position in the array | Array |
| copyWithin() | Copies typed array elements to another position in the array | Typed Array |
| cos(x) | Returns the cosine of x (x is in radians) | Math |
| cosh(x) | Returns the hyperbolic cosine of x | Math |
| count() | Logs the number of times that this particular call to count() has been called | Console |
| create() | Returns an object created from an existing object | Object |
| createAttribute() | Creates an attribute node | HTML Document |
| createComment() | Creates a Comment node with the specified text | HTML Document |
| create DocumentFragment() |
Creates an empty DocumentFragment node | HTML Document |
| createElement() | Creates an element node | HTML Document |
| createEvent() | Creates a new event | HTML Document Event |
| createTextNode() | Creates a Text node | HTML Document |
| ctrlKey | Returns whether the "CTRL" key was pressed when the mouse event was triggered | MouseEvent KeyboardEvent TouchEvent |
| currentTarget | Returns the element whose event listeners triggered the event | Event |
| data | Returns the inserted characters | InputEvent |
| dataTransfer | Returns an object containing the data being dragged/dropped, or inserted/deleted | DragEvent InputEvent |
| debugger | Stops the execution of JavaScript, and calls (if available) the debugging function | Statements |
| decodeURI() | Decodes a URI | Global |
| decodeURIComponent() | Decodes a URI component | Global |
| defaultPrevented | Returns whether or not the preventDefault() method was called for the event | Event |
| defaultStatus | Sets or returns the default text in the statusbar of a window | Window Object |
| defaultView | Returns the window object associated with a document, or null if none is available. | HTML Document |
| defineProperties() | Adds or changes properties | Object |
| defineProperty() | Adds or changes a property | Object |
| defineProperty() | Traps defineProperty() | Proxy |
| defineProperty() | Defines or modifies a property | Reflect |
| delete | Deletes a property from an object | Objects |
| delete() | Deletes an element from a map | Map |
| delete() | Deletes an element from a set | Set |
| deleteProperty() | Traps the delete operator | Proxy |
| deleteProperty() | Deletes a property from an object | Reflect |
| deltaX | Returns the horizontal scroll amount of a mouse wheel (x-axis) | WheelEvent |
| deltaY | Returns the vertical scroll amount of a mouse wheel (y-axis) | WheelEvent |
| deltaZ | Returns the scroll amount of a mouse wheel for the z-axis | WheelEvent |
| deltaMode | Returns a number that represents the unit of measurements for delta values (pixels, lines or pages) | WheelEvent |
| designMode | Controls whether the entire document should be editable or not. | HTML Document |
| detail | Returns a number that indicates how many times the mouse was clicked | Event |
| difference() | Returns the difference between two sets | Set |
| dir | Sets or returns the value of the dir attribute of an element | HTML Element |
| dir() | Displays a list of the properties of a JavaScript object | Window Console |
| do ... while | Executes a block of statements and repeats the block while a condition is true | Statements |
| doctype | Returns the Document Type Declaration associated with the document | HTML Document |
| document | Returns the Document object for the window | Window Object |
| documentElement | Returns the Document Element of the document (the <html> element) | HTML Document |
| documentMode | Returns the mode used by the browser to render the document | HTML Document |
| documentURI | Sets or returns the location of the document | HTML Document |
| domain | Returns the domain name of the server that loaded the document | HTML Document |
| dotAll | Returns true if the s modifier is set in the expression | RegExp |
| drop() | Returns an iterator with a number of elements dropped | Iterator |
| E | Returns Euler's number (approx. 2.718) | Math |
| elapsedTime | Returns the number of seconds an animation has been running | AnimationEvent |
| elapsedTime | Returns the number of seconds a transition has been running | |
| embeds | Returns a collection of all <embed> elements the document | HTML Document |
| encodeURI() | Encodes a URI | Global |
| encodeURIComponent() | Encodes a URI component | Global |
| endsWith() | Checks whether a string ends with specified string/characters | String |
| entries() | Returns an Iterator with the key/value pairs of an array | Array |
| entries() | Returns an Iterator with the key/value pairs of a map | Maps |
| entries() | Returns an Iterator with the key/value pairs of an object | Objects |
| entries() | Returns an Iterator with the key/value pairs of a det | Sets |
| entries() | Returns an Iterator with the key/value pairs of an array | Typed Array |
| entries() | Returns an Iterator with the key/value pairs a NodeList | NodeList |
| entries() | Returns an Iterator with the key/value pairs of a DOMTokenList | DOMTokenList |
| EPSILON | Returns the difference between 1 and the smallest number | Number |
| equals() | Returns true if this Instant is equal to another Instant | Instant |
| equals() | Returns true if this PlainDate is equal to another PlainDate | PlainDate |
| equals() | Returns true if this PlainDateTime is equal to another | PlainDateTime |
| equals() | Returns true if this PlainMonthDay is equal to another | PlainMonthDay |
| equals() | Returns true if this PlainTime is equal to another PlainTime | PlainTime |
| equals() | Returns true if this PlainYearMonth is equal to another PlainYearMonth | PlainYearMonth |
| equals() | Returns true if this ZonedDateTime is equal to another | ZonedDateTime |
| error() | Outputs an error message to the console | Console |
| escape() | Deprecated.Use encodeURI() instead | Global |
| escape() | Returns string where all regular expressions are escaped | RegExp |
| eval() | Evaluates a string and executes it as if it was script code | Global |
| eventPhase | Returns which phase of the event flow is currently being evaluated | Event |
| every() | Returns true if every element in an array pass a test | Array |
| every() | Returns true if every element in an Iterator pass a test | Iterator |
| every() | Returns true if every element in a Typed Array pass a test | Typed Array |
| exec() | Tests for a match in a string. Returns the first match | RegExp |
| execCommand() | Invokes the specified clipboard operation on the element currently having focus. | HTML Document |
| exitFullscreen() | Cancels an element in fullscreen mode | HTML Element |
| exp(x) | Returns the value of Ex | Math |
| expm1(x) | Returns the value of Ex minus 1 | Math |
| export | Export functions so they can be used for imports in external modules, and other scripts | |
| extends | Extends a class (inherit) | Classes |
| f16round() | Returns the nearest 16-bit floating point representation of a number | Math |
| fill() | Fills all elements in an array with a value | Array |
| fill() | Fills all array elements with a value | Typed Array |
| filter() | Creates a new Array with elements that pass a test | Array |
| filter() | Creates a new Iterator with elements that pass a test | Iterator |
| filter() | Creates a new Typed Array with elements that pass a test | Typed Array |
| finally() | A callback function to run when a promise is settled | Promise |
| find() | Returns the value of the first element in an array that pass a test | Array |
| find() | Returns the value of the first element that passes a test | Iterator |
| find() | Returns the value of the first element that passes a test | Typed Array |
| findIndex() | Returns the index of the first element in an array that pass a test | Array |
| findIndex() | Returns the index of the first element that passes a test | Typed Array |
| findLast() | Returns the value of the last element in an array that pass a test | Array |
| findLast() | Returns the value of the last element that passes a test | Typed Array |
| findLastIndex() | Returns the index of the last element in an array that pass a test | Array |
| findLastIndex() | Returns the index of the last element that passes a test | Typed Array |
| firstChild | Returns the first child node of a node | HTML Element |
| firstElementChild | Returns the first child element of the specified element | HTML Element |
| flags | Returns s sting with the flags set in the expression | RegExp |
| flat() | Concatenates sub-array elements | Array |
| flatMap() | Maps array elements and creates a new flat array | Array |
| flatMap() | Maps iterator elements and creates a new flat iterator | Iterators |
| Float16Array | Typed array of 16-bit floating point numbers | Typed Arrays |
| Float32Array | Typed array of 32-bit floating point numbers | Typed Arrays |
| Float64Array | Typed array of 64-bit floating point numbers | Typed Arrays |
| floor() | Returns x, rounded downwards to the nearest integer | Math |
| focus() | Sets focus to an element | HTML Element |
| focus() | Sets focus to a window | Window Object |
| for | Marks a block of statements to be executed as long as a condition is true | Statements |
| for ... in | Marks a block of statements to be executed for each element of an object (or array) | Statements |
| forEach() | Calls a function for each Array element | Array |
| forEach() | Calls a function for each Iterator element | Iterator |
| forEach() | Calls a function for each Map element | Map |
| forEach() | Calls a function for each Set element | Set |
| forEach() | Calls a function for each Array element | Typed Array |
| forEach() | Calls a function for each NodeList element | NodeList |
| forEach() | Calls a function for each DOMTokenList element | DOMTokenList |
| forms | Returns a collection of all <form> elements in the document | HTML Document |
| forward() | Loads the next URL in the history list | History |
| frameElement | Returns the <iframe> element of the current window | Window Object |
| frames | Returns all <iframe> elements in the current window | Window Object |
| freeze() | Prevents any changes to an object | Object |
| from() | returns a new Array from an object | Array |
| from() | Returns an Iterator from any iterable | Iterator |
| from() | Returns a Duration from a Duration or an ISO string | Duration |
| from() | Returns a Instant from an ISO string | Instant |
| fromEpochMilliseconds() | Returns an Instant object from a number of milliseconds | Instant |
| fromEpochNanoseconds() | Returns an Instant object from a number of nanoseconds | Instant |
| from() | Returns a PlainDate from an object or an ISO String | PlainDate |
| from() | Returns a PlainDateTime from an object or an ISO String | PlainDateTime |
| from() | Returns a PlainMonthDay from an object or an ISO String | PlainMonthDay |
| from() | Returns a PlainTime from an object or an ISO String | PlainTime |
| from() | Returns a PlainYearMonth from an object or an ISO String | PlainYearMonth |
| from() | Returns a Typed Array from any Object with a length property | Typed Array |
| from() | Returns a ZonedDateTime from an object or an ISO String | ZonedDateTime |
| fromCharCode() | Converts Unicode values to characters | String |
| fromEntries() | Returns an object created from an iterable list of key/value pairs | Object |
| fround() | Returns the nearest (32-bit single precision) float representation of a number | Math |
| fullscreenElement | Returns the current element that is displayed in fullscreen mode | HTML Document |
| fullscreenEnabled() | Returns a boolean value indicating whether the document can be viewed in fullscreen mode | HTML Document |
| function | Declares a function | Statements |
| geolocation | Returns a Geolocation object that can be used to locate the user's position | Navigator |
| get() | Gets the value of a key in a map | Map |
| get() | A trap for the internal [[Get]] method | Proxy |
| get() | A trap for the internal [[Get]] method | Reflect |
| getAttribute() | Returns the specified attribute value of an element node | HTML Element |
| getAttributeNode() | Returns the specified attribute node | HTML Element |
| getBoundingClientRect() | Returns the size of an element and its position relative to the viewport | HTML Element |
| getComputedStyle() | Gets the current computed CSS styles applied to an element | Window Object |
| getCurrentPosition() | Returns the current position of the device | Geolocation |
| getCurrentPosition() | Returns the current position of the device | API Geolocation |
| getDate() | Returns the day of the month (from 1-31) | Date |
| getDay() | Returns the day of the week (from 0-6) | Date |
| getElementById() | Returns the element that has the ID attribute with the specified value | HTML Document |
| getElementsBy ClassName() |
Returns a NodeList containing all elements with the specified class name | HTML Document |
| getElementsBy ClassName() |
Returns a collection of all child elements with a given class name | HTML Element |
| getElementsBy Name() |
Returns a NodeList containing all elements with a specified name | HTML Document |
| getElementsBy TagName() |
Returns a NodeList containing all elements with the specified tag name | HTML Document |
| getElementsBy TagName() |
Returns a collection of all child elements with a given tag name | HTML Element |
| getFullYear() | Returns the year | Date |
| getHours() | Returns the hour (from 0-23) | Date |
| getItem() | Returns the value of the specified key name | Storage |
| getMilliseconds() | Returns the milliseconds (from 0-999) | Date |
| getMinutes() | Returns the minutes (from 0-59) | Date |
| getModifierState() | Returns an array containing target ranges that will be affected by the insertion/deletion | MouseEvent |
| getMonth() | Returns the month (from 0-11) | Date |
| getNamedItem() | Returns a specified attribute node from a NamedNodeMap | Attribute |
| getOwnProperty Descriptor() |
Returns a property descriptor | Proxy |
| getOwnProperty Descriptor() |
Returns a property descriptor | Reflect |
| getOwn PropertyDescriptor() |
Returns the property descriptors of an object | Object |
| getOwn PropertyDescriptors() |
Returns the property descriptors of an object | Object |
| getOwn PropertyNames() |
Returns an array with the properties of an object | Object |
| getPrototypeOf() | Returns the prototype of an object | Proxy |
| getPrototypeOf() | Returns the prototype of an object | Reflect |
| getSeconds() | Returns the seconds (from 0-59) | Date |
| getSelection() | Returns a Selection object representing the range of text selected by the user | Window Object |
| getTargetRanges() | Returns an array containing target ranges that will be affected by the insertion/deletion | InputEvent |
| getTime() | Returns the number of milliseconds since midnight Jan 1 1970, and a specified date | Date |
| getTimezoneOffset() | Returns the time difference between UTC time and local time, in minutes | Date |
| getTimeZoneTransition() | Returns a ZonedDateTime representing the closest instant after or before the time zone's UTC offset changes. | ZonedDateTime |
| getUTCDate() | Returns the day of the month, according to universal time (from 1-31) | Date |
| getUTCDay() | Returns the day of the week, according to universal time (from 0-6) | Date |
| getUTCFullYear() | Returns the year, according to universal time | Date |
| getUTCHours() | Returns the hour, according to universal time (from 0-23) | Date |
| getUTCMilliseconds() | Returns the milliseconds, according to universal time (from 0-999) | Date |
| getUTCMinutes() | Returns the minutes, according to universal time (from 0-59) | Date |
| getUTCMonth() | Returns the month, according to universal time (from 0-11) | Date |
| getUTCSeconds() | Returns the seconds, according to universal time (from 0-59) | Date |
| getYear() | Deprecated. Use getFullYear() instead | Date |
| global | Checks whether the "g" modifier is set | RegExp |
| go() | Loads a specific URL from the history list | History |
| group() | Creates a new inline group in the console. This indents following console messages by an additional level, until console.groupEnd() is called | Console |
| groupBy() | Groups iterable elements using values returned from a function | Map |
| groupBy() | Groups iterable elements using string values returned from a function | Objects |
| groupCollapsed() | Creates a new inline group in the console. However, the new group is created collapsed. The user will need to use the disclosure button to expand it | Console |
| groupEnd() | Exits the current inline group in the console | Console |
| has() | Returns true if a key exists in a map | Map |
| has() | Intercepts the in operator | Proxy |
| has() | Returns true if a property exists in an object | Reflect |
| has() | Returns true if a value exists in a det | Sets |
| hasAttribute() | Returns true if an element has the specified attribute, otherwise false | HTML Element |
| hasAttributes() | Returns true if an element has any attributes, otherwise false | HTML Element |
| hasChildNodes() | Returns true if an element has any child nodes, otherwise false | HTML Element |
| hasFocus() | Returns a boolean value indicating whether the document has focus | HTML Document |
| hash | Sets or returns the anchor part (#) of a URL | Window Object |
| hasIndices | Returns true if the "d" modifier is set in the expression | RegExp |
| head | Returns the <head> element of the document | HTML Document |
| height | Returns the total height of the screen | Screen |
| history | Returns the History object for the window | Window Object |
| host | Sets or returns the hostname and port number of a URL | Window Object |
| hostname | Sets or returns the hostname of a URL | Window Object |
| href | Sets or returns the entire URL | Window Object |
| id | Sets or returns the value of the id attribute of an element | HTML Element |
| if ... else ... else if | Marks a block of statements to be executed depending on a condition | Statements |
| ignoreCase | Checks whether the "i" modifier is set | RegExp |
| images | Returns a collection of all <img> elements in the document | HTML Document |
| implementation | Returns the DOMImplementation object that handles this document | HTML Document |
| importNode() | Imports a node from another document | HTML Document |
| in | Returns true if a property is in a specified object | Operators |
| includes() | Returns true if an array includes a specified value | Array |
| includes() | Returns true if a typed array includes a specified value | Typed Array |
| includes() | Returns true if a string contains a specified value | Strings |
| indexOf() | Returns the position of an element in an array | Array |
| indexOf() | Returns the position of an element in a string | Strings |
| indexOf() | Returns the position of an element in a typed array | Typed Array |
| Infinity | A numeric value that represents positive/negative infinity | Global |
| info() | Outputs an informational message to the console | Console |
| innerHeight | Returns the height of the window's content area (viewport) including scrollbars | Window Object |
| innerHTML | Sets or returns the content of an element | HTML Element |
| innerText | Sets or returns the text content of a node and its descendants | HTML Element |
| innerHeight | Returns the height of a window's content area (viewport) | Window Object |
| innerWidth | Returns the width of a window's content area (viewport) | Window Object |
| inputEncoding | Returns the encoding, character set, used for the document | HTML Document |
| inputType | Returns the type of the change (i.e "inserting" or "deleting") | InputEvent |
| insertAdjacentElement() | Inserts a HTML element at the specified position relative to the current element | HTML Element |
| insertAdjacentHTML() | Inserts a HTML formatted text at the specified position relative to the current element | HTML Element |
| insertAdjacentText() | Inserts text into the specified position relative to the current element | HTML Element |
| insertBefore() | Inserts a new child node before a specified, existing, child node | HTML Element |
| instanceof | Returns true if an object is an instance of a specified object | Operators |
| instant() | Returns current time as a Temporal.Instant object | Temporal.Now |
| Int8Array | Typed array of 8-bit signed integers | Typed Array |
| Int16Array | Typed array of 16-bit signed integers | Typed Array |
| Int32Array | Typed array of 32-bit signed integers | Typed Array |
| intersection() | Returns the intersection of two sets | Set |
| isArray() | Checks whether an object is an array | Array |
| isDisjointFrom() | Returns true if no Set elements are elements in the argument Set | Set |
| isError() | Returns true if a passed value is an Error | Error |
| isExtensible() | Returns true if an object is extensible | Proxy |
| isExtensible() | Returns true if an object is extensible | Reflect |
| isFinite() | Rturns true if a Number is a finite number | Number |
| isNaN() | Returns true if the value of a Number is NaN | Number |
| isSubsetOf() | Returns true if all Set elements are elements in the argument Set | Set |
| isSupersetOf() | Returns true if all elements in the argument Set are also in this Set | Set |
| isWellFormed() | Returns true if a string is well formed | String |
| isComposing | Returns whether the state of the event is composing or not | InputEvent KeyboardEvent |
| isContentEditable | Returns true if the content of an element is editable, otherwise false | HTML Element |
| isDefaultNamespace() | Returns true if a specified namespaceURI is the default, otherwise false | HTML Element |
| isEqualNode() | Checks if two elements are equal | HTML Element |
| isExtensible() | Returns true if an object is extensible | Object |
| isFinite() | Determines whether a value is a finite, legal number | Global Number |
| isFrozen() | Returns true if an object is frozen | Object |
| isId | Returns true if the attribute is of type Id, otherwise it returns false | Attribute |
| isInteger() | Checks whether a value is an integer | Number |
| isNaN() | Determines whether a value is an illegal number | Global Number |
| isSafeInteger() | Checks whether a value is a safe integer | Number |
| isSameNode() | Checks if two elements are the same node | HTML Element |
| isSealed() | Returns true if an object is sealed | Object |
| isSupported() | Returns true if a specified feature is supported on the element | HTML Element |
| isTrusted | Returns whether or not an event is trusted | Event |
| item() | Returns the attribute at a specified index | Attribute |
| item() | Returns the element at a specified index | HTML Collection |
| item() | Returns the node at a specified index | HTML NodeList |
| item() | Returns the token at a specified index | DOMTokenList |
| javaEnabled() | Returns true if the browser has Java enabled | Window Navigator |
| join() | Returns all elements of an array joined as a string | Array |
| join() | Returns all elements of a typed array joined as a string | Typed Array |
| key | Returns the key value of the key represented by the event | KeyboardEvent StorageEvent |
| key() | Returns the name of the nth key in the storage | Storage |
| keyCode | Returns the Unicode character code of the key that triggered the onkeypress event, or the Unicode key code of the key that triggered the onkeydown or onkeyup event | KeyboardEvent |
| keys() | Returns an Iterator with the keys of an array | Array |
| keys() | Returns an Iterator with the keys of a map | Map |
| keys() | Returns an Iterator with the keys of an object | Object |
| keys() | Returns an Iterator with the keys of a det | Set |
| keys() | Returns an Iterator with the keys of an array | Typed Array |
| keys() | Returns an Iterator with the keys of a NodeList | NodeList |
| keys() | Returns an Iterator with the keys of a DOMTokenList | DOMTokenList |
| lang | Sets or returns the value of the lang attribute of an element | HTML Element |
| language | Returns the language of the browser | Navigator |
| lastChild | Returns the last child node of an element | HTML Element |
| lastElementChild | Returns the last child element of an element | HTML Element |
| lastIndex | Specifies the index at which to start the next match | RegExp |
| lastIndexOf() | Returns the last index of an element in an array | Array |
| lastIndexOf() | Returns the last index of an element in a string | String |
| lastIndexOf() | Returns the last position of an element in a typed array | Typed Array |
| lastModified | Returns the date and time the document was last modified | HTML Document |
| length | Sets or returns the number of elements in an array | Array |
| length | Returns the length of a string | String |
| length | Returns the length of a Typed Array | Typed Array |
| length | Returns the number of (framed) windows in the Window | Window Object |
| length | Returns the number of URLs in the Window history | Window History |
| length | Returns the number of nodes (attributes) in a NamedNodeMap. | HTML Attributes |
| length | Returns the number of elements in an HTMLCollection | HTML Collection |
| length | Returns the number of nodes in a NodeList | HTML NodeList |
| length | Returns the number of tokens in a DOMTokenList | DOMTokenList |
| length | Returns the number of items stored in for this domain | API Storage |
| length | Returns the number of Function parameters | Function |
| lengthComputable | Returns if the length of the progress can be computable | ProgressEvent |
| let | Declares a variable inside brackets {} scope | Statements |
| links | Returns a collection of all <a> and <area> elements in the document that have a href attribute | HTML Document |
| LN2 | Returns the natural logarithm of 2 (approx. 0.693) | Math |
| LN10 | Returns the natural logarithm of 10 (approx. 2.302) | Math |
| loaded | Returns how much work has been loaded | ProgressEvent |
| localeCompare() | Compares two strings in the current locale | String |
| localStorage | Allows to save key/value pairs in a web browser. Stores the data with no expiration date | Window Object |
| location | Returns the location of a key on the keyboard or device | KeyboardEvent |
| location | Returns the Location object for a window | Window Object |
| log() | Returns the natural logarithm of a number | Math Console |
| log() | Writes (logs) a message to the console | Window Console |
| log10() | Returns the base-10 logarithm of a number | Math |
| log1p() | Returns the natural logarithm of 1 + a number | Math |
| log2() | Returns the base-2 logarithm of a number | Math |
| LOG2E | Returns the base-2 logarithm of E (approx. 1.442) | Math |
| LOG10E | Returns the base-10 logarithm of E (approx. 0.434) | Math |
| map() | Creates an array from calling a function for each array element | Array |
| map() | Creates an iterator from calling a function for each iterator element | Iterator |
| map() | Returns a new typed array using a function on every array element | Typed Array |
| match() | Returns the matches in a string against a regular expression | String |
| matchAll() | Returns the matches in a string against a regular expression | Strings |
| matches() | Returns a boolean value indicating whether an element is matched by a specific CSS selector or not | HTML Element |
| matchMedia() | Returns a MediaQueryList object representing the specified CSS media query string | Window Object |
| max() | Returns the number with the highest value | Math |
| MAX_SAFE_INTEGER | Returns the maximum safe integer in JavaScript | Number |
| MIN_SAFE_INTEGER | Returns the minimum safe integer in JavaScript | Number |
| MAX_VALUE | Returns the largest number possible in JavaScript | Number |
| MIN_VALUE | Returns the smallest number possible in JavaScript | Number |
| message | Sets or returns an error message (a string) | Error |
| metaKey | Returns whether the "META" key was pressed when an event was triggered | MouseEvent KeyboardEvent TouchEvent |
| min() | Returns the number with the lowest value | Math |
| multiline | Checks whether the "m" modifier is set | RegExp |
| MIN_VALUE | Returns the smallest number possible in JavaScript | Number |
| moveBy() | Moves a window relative to its current position | Window Object |
| moveTo() | Moves a window to the specified position | Window Object |
| MovementX | Returns the horizontal coordinate of the mouse pointer relative to the position of the last mousemove event | MouseEvent |
| MovementY | Returns the vertical coordinate of the mouse pointer relative to the position of the last mousemove event | MouseEvent |
| name | Sets or returns an Error name | Error |
| name | Returns the name of a function | Function |
| name | Returns the name of the Typed Array | Typed Array |
| name | Returns the name of the Window | Window Object |
| name | Returns the name of the Attribute | HTML Attribute |
| namedItem() | Returns the element with the specified ID, or name, in an HTMLCollection | HTMLCollection |
| namespaceURI | Returns the namespace URI of an element | HTML Element |
| NaN | A number that is not a legal number (Not-a-Number) | Global |
| NaN | A number that is not a legal number (Not-a-Number) | Number |
| negated() | Returns a new duration with this duration negated | Duration |
| navigator | Returns the Navigator object for a window | Window Object |
| NEGATIVE_INFINITY | Represents negative infinity (returned on overflow) | Number |
| new (constructor) | Creates a new Array object | Array |
| new (constructor) | Creates a new Boolean object | Boolean |
| new (constructor) | Creates a new Date object | Date |
| new (constructor) | Creates a new Duration object | Duration |
| new (constructor) | Creates a new Error object | Error |
| new (constructor) | Creates a new Instant object | Instant |
| new (constructor) | Creates a new Map object | Map |
| new (constructor) | Creates a new PlainDate object | PlainDate |
| new (constructor) | Creates a new PlainDateTime object | PlainDateTime |
| new (constructor) | Creates a new PlainMonthDay object | PlainMonthDay |
| new (constructor) | Creates a new PlainTime object | PlainTime |
| new (constructor) | Creates a new PlainYearMonth object | PlainYearMonth |
| new (constructor) | Creates a new Promise object | Promise |
| new (constructor) | Creates a new Set object | Set |
| new (constructor) | Creates a new ZonedDateTime object | ZonedDateTime |
| newURL | Returns the URL after the document anchor has been changed | HTML Event |
| newValue | Returns the new value of the changed storage item | StorageEvent |
| nextSibling | Returns the next node at the same node tree level | HTML Element |
| nextElementSibling | Returns the next element at the same node tree level | HTML Element |
| nodeName | Returns the name of a node | HTML Element |
| nodeType | Returns the node type of a node | HTML Element |
| nodeValue | Sets or returns the value of a node | HTML Element |
| normalize() | Removes empty text nodes, and joins adjacent nodes | HTML Document |
| normalize() | Removes empty text nodes, and joins adjacent nodes | HTML Element |
| normalizeDocument() | Removes empty Text nodes, and joins adjacent nodes | HTML Document |
| now() | Returns the number of milliseconds since midnight Jan 1, 1970 | Date |
| Number() | Converts an object's value to a number | Global |
| of() | Creates an array from a number of arguments | Array |
| of() | Creates a typed array from a number of arguments | Typed Array |
| offsetHeight | Returns the height of an element, including padding, border and scrollbar | HTML Element |
| offsetWidth | Returns the width of an element, including padding, border and scrollbar | HTML Element |
| offsetLeft | Returns the horizontal offset position of an element | HTML Element |
| offsetParent | Returns the offset container of an element | HTML Element |
| offsetTop | Returns the vertical offset position of an element | HTML Element |
| offsetX | Returns the horizontal coordinate of the mouse pointer relative to the position of the edge of the target element | MouseEvent |
| offsetY | Returns the vertical coordinate of the mouse pointer relative to the position of the edge of the target element | MouseEvent |
| oldURL | Returns the URL of the document, before the hash was changed | HTML Event |
| oldValue | Returns the old value of the changed storage item | StorageEvent |
| onabort | Occurs when the loading of a media is aborted | Event |
| onafterprint | Occurs when a page has started printing, or if the print dialogue box has been closed | Event |
| onanimationend | Occurs when a CSS animation has completed | AnimationEvent |
| onanimationiteration | Occurs when a CSS animation is repeated | AnimationEvent |
| onanimationstart | Occurs when a CSS animation has started | AnimationEvent |
| onbeforeprint | Occurs when a page is about to be printed | Event |
| onbeforeunload | Occurs before the document is about to be unloaded | Event |
| onblur | Occurs when an element loses focus | FocusEvent |
| oncanplay | Occurs when the browser can start playing the media (when it has buffered enough to begin) | Event |
| oncanplaythrough | Occurs when the browser can play through the media without stopping for buffering | Event |
| onchange | Occurs when the content of a form element, the selection, or the checked state have changed (for <input>, <select>, and <textarea>) | Event |
| onclick | Occurs when the user clicks on an element | MouseEvent |
| oncontextmenu | Occurs when the user right-clicks on an element to open a context menu | MouseEvent |
| oncopy | Occurs when the user copies the content of an element | ClipboardEvent |
| oncut | Occurs when the user cuts the content of an element | ClipboardEvent |
| ondblclick | Occurs when the user double-clicks on an element | MouseEvent |
| ondrag | Occurs when an element is being dragged | DragEvent |
| ondragend | Occurs when the user has finished dragging an element | DragEvent |
| ondragenter | Occurs when the dragged element enters the drop target | DragEvent |
| ondragleave | Occurs when the dragged element leaves the drop target | DragEvent |
| ondragover | Occurs when the dragged element is over the drop target | DragEvent |
| ondragstart | Occurs when the user starts to drag an element | DragEvent |
| ondrop | Occurs when the dragged element is dropped on the drop target | DragEvent |
| ondurationchange | Occurs when the duration of the media is changed | Event |
| onemptied | Occurs when something bad happens and the media file is suddenly unavailable (like unexpectedly disconnects) | |
| onended | Occurs when the media has reach the end (useful for messages like "thanks for listening") | Event |
| onerror | Occurs when an error occurs while loading an external file | ProgressEventEvent |
| onfocus | Occurs when an element gets focus | FocusEvent |
| onfocusin | Occurs when an element is about to get focus | FocusEvent |
| onfocusout | Occurs when an element is about to lose focus | FocusEvent |
| onfullscreenchange | Occurs when an element is displayed in fullscreen mode | Event |
| onfullscreenerror | Occurs when an element can not be displayed in fullscreen mode | Event |
| onhashchange | Occurs when there has been changes to the anchor part of a URL | HashChangeEvent |
| oninput | Occurs when an element gets user input | InputEvent Event |
| oninvalid | Occurs when an element is invalid | Event |
| onkeydown | Occurs when the user is pressing a key | KeyboardEvent |
| onkeypress | Occurs when the user presses a key | KeyboardEvent |
| onkeyup | Occurs when the user releases a key | KeyboardEvent |
| onLine | Determines whether the browser is online | Navigator |
| onload | Occurs when an object has loaded | Event |
| onloadeddata | Occurs when media data is loaded | Event |
| onloadedmetadata | Occurs when meta data (like dimensions and duration) are loaded | Event |
| onloadstart | Occurs when the browser starts looking for the specified media | ProgressEvent |
| onmessage | Occurs when a message is received through the event source | Event |
| onmousedown | Occurs when the user presses a mouse button over an element | MouseEvent |
| onmouseenter | Occurs when the pointer is moved onto an element | MouseEvent |
| onmouseleave | Occurs when the pointer is moved out of an element | MouseEvent |
| onmousemove | Occurs when the pointer is moving while it is over an element | MouseEvent |
| onmouseover | Occurs when the pointer is moved onto an element, or onto one of its children | MouseEvent |
| onmouseout | Occurs when a user moves the mouse pointer out of an element, or out of one of its children | MouseEvent |
| onmouseup | Occurs when a user releases a mouse button over an element | MouseEvent |
| onmousewheel | Deprecated. Use the wheel event instead |
WheelEvent |
| onoffline | Occurs when the browser starts to work offline | Event |
| ononline | Occurs when the browser starts to work online | Event |
| onopen | Occurs when a connection with the event source is opened | Event |
| onpagehide | Occurs when the user navigates away from a webpage | PageTransition |
| onpageshow | Occurs when the user navigates to a webpage | PageTransition |
| onpaste | Occurs when the user pastes some content in an element | ClipboardEvent |
| onpause | Occurs when the media is paused either by the user or programmatically | Event |
| onplay | Occurs when the media has been started or is no longer paused | Event |
| onplaying | Occurs when the media is playing after having been paused or stopped for buffering | Event |
| onpopstate | Occurs when the window's history changes | PopStateEvent |
| onprogress | Occurs when the browser is in the process of getting the media data (downloading the media) | Event |
| onratechange | Occurs when the playing speed of the media is changed | Event |
| onresize | Occurs when the document view is resized | Event |
| onreset | Occurs when a form is reset | Event |
| onscroll | Occurs when an element's scrollbar is being scrolled | Event |
| onsearch | Occurs when the user writes something in a search field (for <input="search">) | Event |
| onseeked | Occurs when the user is finished moving/skipping to a new position in the media | Event |
| onseeking | Occurs when the user starts moving/skipping to a new position in the media | Event |
| onselect | Occurs after the user selects some text (for <input> and <textarea>) | Event |
| onshow | Occurs when a <menu> element is shown as a context menu | Event |
| onstalled | Occurs when the browser is trying to get media data, but data is not available | Event |
| onstorage | Occurs when a Web Storage area is updated | StorageEvent |
| onsubmit | Occurs when a form is submitted | Event |
| onsuspend | Occurs when the browser is intentionally not getting media data | Event |
| ontimeupdate | Occurs when the playing position has changed (like when the user fast forwards to a different point in the media) | Event |
| ontoggle | Occurs when the user opens or closes the <details> element | Event |
| ontouchcancel | Occurs when the touch is interrupted | TouchEvent |
| ontouchend | Occurs when a finger is removed from a touch screen | TouchEvent |
| ontouchmove | Occurs when a finger is dragged across the screen | TouchEvent |
| ontouchstart | Occurs when a finger is placed on a touch screen | TouchEvent |
| ontransitionend | Occurs when a CSS transition has completed | TransitionEvent |
| onunload | Occurs when a page has unloaded or window has been closed | Event |
| onvolumechange | Occurs when the volume of the media has changed or been muted | Event |
| onwaiting | Occurs when a media has paused but is expected to resume (buffering) | Event |
| onwheel | Occurs when the mouse wheel rolls up or down over an element | WheelEvent |
| open() | Opens an HTML Document to collect output from document.write() | HTML Document |
| open() | Opens a new browser window or a new tab | Window Object |
| opener | Returns a reference to the window that created the window | Window Object |
| origin | Returns the protocol, hostname and port number of a URL | Window Object |
| outerHeight | Returns the height of the browser window with toolbars/scrollbars | Window Object |
| outerHTML | Sets or returns the outer content of an element | HTML Element |
| outerText | Sets or returns the text outer content of a node and its descendants | HTML Element |
| outerHeight | Returns the height of the browser window with toolbars/scrollbars | Window Object |
| outerWidth | Returns the width of the browser window with toolbars/scrollbars | Window Object |
| ownerDocument | Returns the root element (document object) for an element | HTML Element |
| ownKeys() | Traps operations listing keys (properties) | Proxy |
| ownKeys() | Returns an array of an object's own property keys | Reflect |
| padEnd() | Pads a string at the end | String |
| padStart() | Pads a string from the start | String |
| pageX | Returns the horizontal coordinate of the mouse pointer | MouseEvent |
| pageXOffset | Returns the pixels a document has been scrolled | Window Object |
| pageY | Returns the vertical coordinate of the mouse pointer | MouseEvent |
| pageYOffset | Returns the pixels a document has been scrolled | Window Object |
| pageYOffset | Returns the pixels a document has been scrolled | Window Object |
| parent | Returns the parent window of the current window | Window Object |
| parentNode | Returns the parent node of an element | HTML Element |
| parentElement | Returns the parent element node of an element | HTML Element |
| parse() | Parses a string and returns milliseconds since epoch | Date |
| parse() | Parses a string and returns a JavaScript object | JSON |
| parseFloat() | Parses a string and returns the first number | Global |
| parseFloat() | Parses a string and returns the first number | Number |
| parseInt() | Parses a string and returns the first integer | Global |
| parseInt() | Parses a string and returns the first integer | Number |
| pathname | Sets or returns the path name of a URL | Window Object |
| persisted | Returns whether the webpage was cached by the browser | PageTransition |
| PI | Returns PI (approx. 3.14) | Math |
| pixelDepth | Returns the color resolution (in bits per pixel) of the screen | Screen |
| plainDateISO() | Returns a PlainDate representing current date in ISO 8601 | Temporal.Now |
| plainDateTimeISO() | Returns a PlainDateTime representing current date in ISO 8601 | Temporal.Now |
| plainTimeISO() | Returns a PlainTime representing current time in ISO 8601 | Temporal.Now |
| platform | Returns for which platform the browser is compiled | Navigator |
| preventExtentions() | Makes an object non-extensive | Proxy |
| preventExtentions() | Prevent properties from being added to an object | Reflect |
| pop() | Removes the last element of an array, and returns that element | Array |
| port | Sets or returns the port number of a URL | Window Object |
| position | Returns the position of the concerned device at a given time | Geolocation |
| positionError | Returns the reason of an error occurring when using the geolocating device | Geolocation |
| positionOptions | Describes an object containing option properties to pass as a parameter of Geolocation.getCurrentPosition() and Geolocation.watchPosition() | Geolocation |
| POSITIVE_INFINITY | Represents infinity (returned on overflow) | Number |
| pow() | Returns the value of x to the power of y | Math |
| preventDefault() | Cancels the event if it is cancelable, meaning that the default action that belongs to the event will not occur | Event |
| preventExtensions() | Prevents adding new properties to an object | Object |
| previousSibling | Returns the previous node at the same node tree level | HTML Element |
| previousElementSibling | Returns the previous element at the same node tree level | HTML Element |
| print() | Prints the content of the current window | Window Object |
| prompt() | Displays a dialog box that prompts the visitor for input | Window Object |
| prototype | Allows you to add properties and methods to an object | Number Object String |
| product | Returns the engine name of the browser | Navigator |
| propertyName | Returns the name of the CSS property associated with the animation or transition | AnimationEvent TransitionEvent |
| protocol | Sets or returns the protocol of a URL | Window Object |
| prototype | Bult in template for Array properties and methods | Array |
| prototype | Bult in template for Boolean properties and methods | Boolean |
| prototype | Bult in template for Date properties and methods | Date |
| prototype | Bult in template for Object properties and methods | Object |
| prototype | Bult in template for String properties and methods | String |
| pseudoElement | Returns the name of the pseudo-element of the animation or transition | AnimationEvent TransitionEvent |
| push() | Adds new elements to the end of an array, and returns the new length | Array |
| querySelector() | Returns the first element that matches a CSS selector | HTML Document |
| querySelector() | Return first child element that matches a CSS selector | HTML Element |
| querySelectorAll() | Returns all elements that matches a CSS selector | HTML Document |
| querySelectorAll() | Returns all child elements that matches a CSS selector | HTML Element |
| race() | Returns a Promise from a list of promises, when the faster promise settles | Promise |
| random() | Returns a random number between 0 and 1 | Math |
| readyState | Returns the (loading) status of the document | HTML Document |
| reduce() | Reduce the values of an array to a single value | Array |
| reduce() | Reduce the values of an Iterator to a single value | Iterator |
| reduce() | Reduce the values of a Typed Array to a single value | Typed Array |
| reduceRight() | Reduce the values of an array to a single value | Array |
| reduceRight() | Reduce the values of a Typed Array to a single value | Typed Array |
| referrer | Returns the URL of the document that loaded the current document | HTML Document |
| reject() | Returns a Promise object rejected with a value | Promise |
| reload() | Reloads the current document | Window Object |
| remove() | Removes an element from the HTML DOM | HTML Element |
| remove() | Removes an element from a DOMTokenList | DOMTokenList |
| removeAttribute() | Removes an attribute from an element | HTML Element |
| removeAttributeNode() | Removes an attribute from an element | HTML Element |
| removeChild() | Removes a child node from an element | HTML Element |
| removeEventListener() | Removes an event handler from an HTML Document | HTML Document |
| removeEventListener() | Removes an event handler from an HTML Element | HTML Element |
| removeEventlistener() | Removes an event handler from a Window Object | Window Object |
| removeItem() | Removes that key from the storage | Storage |
| removeNamedItem() | Removes a node (by name) in a NamedNodeMap | Attribute |
| removeNamedItem() | Removes a specified attribute node | Attribute |
| renameNode() | Renames the specified node | HTML Document |
| repeat | Returns whether a key is being hold down repeatedly, or not | KeyboardEvent |
| repeat() | Returns a new string with a specified number of copies of an existing string | String |
| replace() | Replaces a token in a DOMTokenList. | DOMTokenList |
| replace() | Returns a string with a specified value is replaced | String |
| replace() | Replaces the current document with a new one | Window Location |
| replaceAll() | Returns a string with all matches of a specified value are replaced | String |
| replaceChild() | Replaces a child node in an element | HTML Element |
| requestAnimationFrame() | Requests function to update an animation before the next repaint | Window Object |
| requestFullscreen() | Shows an element in fullscreen mode | HTML Element |
| resizeBy() | Resizes the window by the specified pixels | Window Object |
| resizeTo() | Resizes the window to the specified width and height | Window Object |
| resolve() | Returns a Promise object resolved with a value | Promise |
| rest (...) | Destructs an array and collects the leftovers. | Arrays |
| return | Stops the execution of a function and returns a value from that function | Statements |
| reverse() | Reverses the order of the elements in an array | Array |
| reverse() | Reverses the order of the elements in a Typed Array | Typed Array |
| round() | Rounds x to the nearest integer | Math |
| round() | Returns a ZonedDateTime with this ZonedDateTime rounded | ZonedDate |
| relatedTarget | Returns the element related to the element that triggered the mouse event | MouseEvent FocusEvent |
| round() | Returns a new Duration with this Duration rounded | Duration |
| round() | Returns a new Instant with this Instant rounded | Instant |
| round() | Returns a new PlainDateTime with this PlainDateTime rounded | PlainDateTime |
| round() | Returns a new PlainTime with this PlainTime rounded | PlainTime |
| screen | Returns the Screen object for the window | Window Object |
| screenLeft | Retrns the left position of a window | Window Object |
| screenTop | Retrns the top position of a window | Window Object |
| screenX | Returns the horizontal coordinate of the window/mouse pointer | Window Object |
| screenX | Returns the vertical coordinate of the mouse pointer | Window Object |
| screenY | Returns the vertical coordinate of the mouse pointer | Window Object |
| scripts | Returns a collection of <script> elements in the document | HTML Document |
| scroll() | Deprecated. Use scrollTo() instead. | Window Object |
| scrollBy() | Scrolls the document by the specified number of pixels | Window Object |
| scrollHeight | Returns the entire height of an element, including padding | HTML Element |
| scrollIntoView() | Scrolls the specified element into the visible area of the browser window | HTML Element |
| scrollLeft | Sets or returns the number of pixels an element's content is scrolled horizontally | HTML Element |
| scrollTo() | Scrolls the document to the specified coordinates | Window Object |
| scrollTop | Sets or returns the number of pixels an element's content is scrolled vertically | HTML Element |
| scrollWidth | Returns the entire width of an element, including padding | HTML Element |
| scrollX | An alias of pageXOffset | Window Object |
| scrollY | An alias of pageYOffset | Window Object |
| seal() | Prevents additions or deletions of new properties | Object |
| search | Sets or returns the querystring part of a URL | Window Object |
| search() | Searches a string for a specified value, or regular expression, and returns the position of the match | String |
| self | Returns the current window | Window Object |
| sessionStorage | Allows to save key/value pairs in a web browser. Stores the data for one session | Window Object |
| set() | Sets the value for a key in a map | Map |
| set() | Traps the internal [[Set]] method | Proxy |
| set() | Sets the value of a property | Reflect |
| set() | Stores values in a typed array from another array | Typed Array |
| setAttribute() | Sets or changes the specified attribute, to the specified value | HTML Element |
| setAttributeNode() | Sets or changes the specified attribute node | HTML Element |
| setDate() | Sets the day of the month of a date object | Date |
| setFullYear() | Sets the year of a date object | Date |
| setHours() | Sets the hour of a date object | Date |
| setInterval() | Calls a function / evaluates an expression at specified intervals | Window Object |
| setItem() | Adds or updates the value of the a storage object item | Storage |
| setMilliseconds() | Sets the milliseconds of a date object | Date |
| setMinutes() | Set the minutes of a date object | Date |
| setMonth() | Sets the month of a date object | Date |
| setNamedItem() | Sets the specified attribute node (by name) | Attribute |
| setPrototypeOf() | Traps setPrototypeOf() | Proxy |
| setPrototypeOf() | Sets the prototype of an object | Reflect |
| setSeconds() | Sets the seconds of a date object | Date |
| setTime() | Sets a date to a specified number of milliseconds after epoch | Date |
| setTimeout() | Calls a function or evaluates an expression after a number of milliseconds | Window Object |
| setUTCDate() | Sets the day of the month of a date object, according to universal time | Date |
| setUTCFullYear() | Sets the year of a date object, according to universal time | Date |
| setUTCHours() | Sets the hour of a date object, according to universal time | Date |
| setUTCMilliseconds() | Sets the milliseconds of a date object, according to universal time | Date |
| setUTCMinutes() | Set the minutes of a date object, according to universal time | Date |
| setUTCMonth() | Sets the month of a date object, according to universal time | Date |
| setUTCSeconds() | Set the seconds of a date object, according to universal time | Date |
| setYear() | Deprecated. Use setFullYear() instead |
Date |
| shift() | Removes the first element of an array, and returns that element | Array |
| shiftKey | Returns whether the "SHIFT" key was pressed when an event was triggered | MouseEvent KeyboardEvent TouchEvent |
| sign(x) | Returns the sign of a number (checks whether it is positive, negative or zero) | Math |
| sin() | Returns the sine of x (x is in radians) | Math |
| sinh() | Returns the hyperbolic sine of x | Math |
| since() | Returns the Duration from another Instant | Instant |
| since() | Returns the Duration from another PlainDate | PlainDate |
| since() | Returns the Duration from another PlainDateTime | PlainDateTime |
| since() | Returns the Duration from another PlainTime | PlainTime |
| since() | Returns the Duration from another PlainYearMonth | PlainYearMonth |
| since() | Returns the Duration from another ZonedDateTime | ZonedDateTime |
| size | Returns the number of map elements | Map |
| size | Returns the number of set elements | Set |
| slice() | Returns an array with selected elements from an array | Array |
| slice() | Returns a string with selected characters from a string | Strings |
| slice() | Returns a typed array with selected elements from another array | Typed Array |
| some() | Returns true if some elements in an array pass a test | Array |
| some() | Returns true if some elements in an interator pass a test | Iterators |
| some() | Returns true if a function returns true for any array element | Typed Array |
| sort() | Sorts the elements of an array | Array |
| sort() | Returns a sorted typed array. | Typed Array |
| source | Returns the text of the RegExp pattern | RegExp |
| specified | Returns true if the attribute has been specified, otherwise it returns false | Attribute |
| splice() | Adds/Removes elements from an array | Array |
| split() | Splits a string into an array of substrings | String |
| spread (...) | Splits an array into individual elements. | Array |
| sqrt() | Returns the square root of x | Math |
| SQRT1_2 | Returns the square root of 1/2 (approx. 0.707) | Math |
| SQRT2 | Returns the square root of 2 (approx. 1.414) | Math |
| static | Defines a static method for a class | Classes |
| startsWith() | Checks whether a string begins with specified characters | String |
| state | Returns an object containing a copy of the history entries | PopStateEvent |
| status | Sets or returns the text in the statusbar of a window | Window Object |
| sticky | Returns true if the /y modifier is set in an expression | RegExp |
| stop() | Stops the window from loading | Window Object |
| stopImmediate Propagation() |
Prevents other listeners of the same event from being called | Event |
| stopPropagation() | Prevents further propagation of an event during event flow | Event |
| storageArea | Returns an object representing the affected storage object | StorageEvent |
| String() | Converts a value to a string | Global |
| stringify() | Convert a JavaScript object to a JSON string | JSON |
| strictErrorChecking | Deprecated. Sets or returns whether error-checking is enforced or not | HTML Document |
| style | Sets or returns the value of the style attribute of an element | HTML Element |
| subarray() | Creates a new typed array in the same memory space | Typed Array |
| substr() | Deprecated. Use substring() or slice() instead | String |
| substring() | Extracts characters (between two indices) from a string | String |
| subtract() | Returns a Duration with a Duration subtracted | Duration |
| subtract() | Returns an Instant with a Duration subtracted | Instant |
| subtract() | Returns a PlainDate with a Duration subtracted | PlainDate |
| subtract() | Returns a PlainDateTime with a Duration subtracted | PlainDateTime |
| subtract() | Returns a PlainTime with a Duration subtracted | PlainTime |
| subtract() | Returns a PlainYearMonth with a Duration subtracted | PlainYearMonth |
| subtract() | Returns a ZonedDatetime with a Duration subtracted | ZonedDateTime |
| super | Refers to the parent class | Classes |
| supports() | Returns true if a token is one of an attribute's supported tokens | DOMTokenList |
| switch | Marks a block of statements to be executed depending on different cases | Statements |
| symmetricDifference() | Returns the symmetric difference between two sets | Set |
| table() | Displays tabular data as a table | Console |
| tabIndex | Sets or returns the value of the tabindex attribute of an element | HTML Element |
| tagName | Returns the tag name of an element | HTML Element |
| taintEnabled() | Deprecated. | Window Navigator |
| take() | Returns an iterator with specific elements from an iterator. | Iterators |
| tan() | Returns the tangent of an angle | Math |
| tanh() | Returns the hyperbolic tangent of a number | Math |
| target | Returns the element that triggered the event | Event |
| targetTouches | Returns a list of all the touch objects that are in contact with the surface and where the touchstart event occured on the same target element as the current target element | TouchEvent |
| test() | Tests for a match in a string. Returns true or false | RegExp |
| textContent | Sets or returns the textual content of a node and its descendants | HTML Element |
| then() | Provides two callbacks: One funtion to run when a promise is fulfilled and one funtion to run when a promise is rejected | Promise |
| this | Refers to the object it belongs to | |
| throw | Throws (generates) an error | Statements |
| time() | Starts a timer (can track how long an operation takes) | Console |
| timeEnd() | Stops a timer that was previously started by console.time() | Console |
| timeStamp | Returns the time (in milliseconds) when the event was created | Event |
| timeZoneId() | Returns a time zoneId representing the system's current time zone | Temporal.Now |
| title | Sets or returns the title of the document | HTML Document HTML Element |
| toDateString() | Converts the date portion of a Date object into a readable string | Date |
| toExponential() | Converts a number into an exponential notation | Number |
| toFixed(x) | Formats a number with x numbers of digits after the decimal point | Number |
| toggle() | Adds one (or more) tokens to a DOMTokenList | DOMTokenList |
| toGMTString() | Deprecated. Use toUTCString() instead | Date |
| toInstant() | Returns an Instant representing the ZonedDateTime | ZonedDateTime |
| toISOString() | Returns a Date as a string, using the ISO standard | Date |
| toJSON() | Returns a Date as an ISO/RFC 9557 String | Date |
| toJSON() | Returns a Duration as an ISO/RFC 9557 String | Duration |
| toJSON() | Returns a Instant as an ISO/RFC 9557 String | Instant |
| toJSON() | Returns a PlainDate as an ISO/RFC 9557 String | PlainDate |
| toJSON() | Returns a PlainDateTime as an ISO/RFC 9557 String | PlainDateTime |
| toJSON() | Returns a PlainMonthDay as an ISO/RFC 9557 String | PlainMonthDay |
| toJSON() | Returns a PlainTime as an ISO/RFC 9557 String | PlainTime |
| toJSON() | Returns a PlainYearMonth as an ISO/RFC 9557 String | PlainYearMonth |
| toJSON() | Returns a ZonedDateTime as an ISO/RFC 9557 String | ZonedDateTime |
| toLocaleDateString() | Returns the date portion of a Date object as a string, using locale conventions | Date |
| toLocaleLowerCase() | Converts a string to lowercase letters, according to the host's locale | String |
| toLocaleString() | Returns the Date as a string using locale settings | Date |
| toLocaleString() | Returns a Duration as a string using locale settings | Duration |
| toLocaleString() | Returns an Intant as a string using locale settings | Instant |
| toLocaleString() | Returns a Date as a string using locale settings | Number |
| toLocaleString() | Returns a PlainDate as a string using locale settings | PlainDate |
| toLocaleString() | Returns a PlainDateTime as a string using locale settings | PlainDateTime |
| toLocaleString() | Returns a PlainMontDay as a string using locale settings | PlainMonthDay |
| toLocaleString() | Returns a PlainTime as a string using locale settings | PlainTime |
| toLocaleString() | Returns a PlainYearMonth a string using locale settings | PlainYearMonth |
| toLocaleString() | Returns an array as strings using locale settings | Typed Array |
| toLocaleString() | Returns a ZonedDateTime as a string using locale settings | ZonedDateTime |
| toLocaleTimeString() | Returns the time of a Date as a string using locale settings | Date |
| toLocaleUpperCase() | Converts a string to uppercase letters, according to the host's locale | String |
| toLowerCase() | Converts a string to lowercase letters | String |
| top | Returns the topmost browser window | Window Object |
| toPlainDate() | Returns a PlainDate representing this PlainDateTime | PlainDateTime |
| toPlainDate() | Returns a PlainDate representing this PlainMonthDay and a year | PlainMonthDay |
| toPlaindate() | Returns a PlainDate representing this PlainYearMonth and a day | PlainYearMonth |
| toPlainDate() | Returns a PlainDate representing the ZonedDateTime | ZonedDateTime |
| toPlainDateTime() | Returns a PlainDateTime representing this PlainDate | PlainDate |
| toPlainDateTime() | Returns a PlainDateTime representing the ZonedDateTime | ZonedDateTime |
| toPlainMonthDay() | Returns a PlainMonthDay representing this PlainDate | PlainDate |
| toPlainTime() | Returns a PlainTime representing this PlainDateTime | PlainDateTime |
| toPlainTime() | Returns a PlainTime representing the ZonedDateTime | ZonedDateTime |
| toPlainYearMonth() | Returns a PlainYearMonth representing this PlainDate | PlainDate |
| toPrecision(x) | Formats a number to x length | Number |
| toReversed() | Returns a new reversed Array | Array |
| toReversed() | Returns a new reversed Typed Array | Typed Array |
| toSorted() | Returns a new sorted Array | Array |
| toSorted() | Returns a new sorted Typed Array | Typed Array |
| toSpliced() | Adds or removes array elements (to a new array) | Array |
| startofday() | Returns the first ZonedDateTime instant of this date | ZonedDateTime |
| toString() | Returns the string values of aa Array | Array |
| toString() | Returns the string value of a boolean | Boolean |
| toString() | Returns the string value of a Date | Date |
| toString() | Returns the string value of a function | Function |
| toString() | Returns the string value of a Number | Numbers |
| toString() | Returns [object Object] | Objects |
| toString() | Returns the string value of a regular expression | RegExp |
| toString() | Returns the string value of a string | Strings |
| toString() | Returns the string values of a Typed Array | Typed Array |
| toString() | Returns the string value of a Duration | Duration |
| toString() | Returns the string value of an Instant | Instant |
| toString() | Returns the string value of a PlainDate | PlainDate |
| toString() | Returns the string value of a PlainDateTime | PlainDateTime |
| toString() | Returns the string value of a PlainMonthDay | PlainMonthDay |
| toString() | Returns the string value of a PlainTime | PlainTime |
| toString() | Returns the string value of a PlainYearMonth | PlainYearMonth |
| toString() | Returns the string value of a ZonedDateTime | ZonedDateTime |
| total() | Returns a number representing a total duration | Duration |
| total | Returns the total amount of work that will be loaded | ProgressEvent |
| toTimeString() | Converts the time portion of a Date object to a string | Date |
| touches | Returns a list of all touch objects currently in contact with the surface | TouchEvent |
| toUpperCase() | Converts a string to uppercase letters | String |
| toUTCString() | Converts a Date object to a string, according to universal time | Date |
| toWellFormed() | Returns a string with "lone surrogates" replaced as Unicode | Strings |
| toZonedDateTime() | Returns a ZonedDateTime representing this PlainDate | PlainDate |
| toZonedDateTime() | Returns a ZonedDateTime representing this PlainDateTime | PlainDateTime |
| toZonedDateTimeISO() | Returns a ZonedDateTime representing this Instant | Instant |
| trace() | Outputs a stack trace to the console | Console |
| transitionend | Occurs when a CSS transition has completed | TransitionEvent |
| trim() | Removes whitespace from both ends of a string | String |
| trimEnd() | Returns a string with removed whitespaces from the end | String |
| trimStart() | Returns a string with removed whitespaces from the start | String |
| trunc() | Returns the integer part of a number (x) | Math |
| try() | Executes a function and wraps the result in a promise | Promises |
| try ... catch ... finally | Marks the block of statements to be executed when an error occurs in a try block, and implements error handling | Statements |
| type | Returns the name of the event | Event |
| typeof | Returns the type of a variable | Operators |
| Uint8Array | Typed array of 8-bit unsigned integers | Typed Arrays |
| Uint8ClampedArray | Typed array of 8-bit clamped integers | Typed Arrays |
| Uint16Array | Typed array of 16-bit unsigned integers | Typed Arrays |
| Uint32Array | Typed array of 32-bit unsigned integers | Typed Arrays |
| undefined | Indicates that a variable has not been assigned a value | Global |
| unescape() | Deprecated. Use decodeURI() instead | Global |
| unicode | Returns true if the u flag is set in an expression | RegExp |
| unicodeSets | Returns true if the v flag is set in an expression | RegExp |
| union() | Returns the union of two sets | Set |
| unshift() | Adds new elements to the beginning of an array, and returns the new length | Array |
| until() | Returns the Duration from this Instant until another | Instant |
| until() | Returns the Duration from this PlainDate until another | PlainDate |
| until() | Returns the Duration from this PlainDateTime until another | PlainDateTime |
| until() | Returns the Duration from this PlainTime until another | PlainTime |
| until() | Returns the Duration from this PlainYearMonth until another | PlainYearMonth |
| until() | Returns the Duration from this ZonedDateTime until another | ZonedDateTime |
| url | Returns the URL of the changed item's document | StorageEvent |
| URL | Returns the full URL of the HTML document | HTML Document |
| userAgent | Returns the user-agent header sent by the browser to the server | Navigator |
| UTC() | Returns the number of milliseconds in a date since midnight of January 1, 1970, according to UTC time | Date |
| value | Sets or returns the value of the attribute | Attribute DOMTokenList |
| valueOf() | Returns the primitive values of an array | Array |
| valueOf() | Returns the primitive value of a boolean | Boolean |
| valueOf() | Returns the primitive value of a Date | Date |
| valueOf() | Returns the primitive value of a function | Function |
| valueOf() | Returns the primitive value of a Number | Number |
| valueOf() | Returns [object Object] | Object |
| valueOf() | Returns the primitive value of a string | Strings |
| valueOf() | Throws a TypeError | Duration |
| valueOf() | Throws a TypeError | Instant |
| valueOf() | Throws a TypeError | PlainDate |
| valueOf() | Throws a TypeError | PlainDateTime |
| valueOf() | Throws a TypeError | PlainMonthDay |
| valueOf() | Throws a TypeError | PlainTime |
| valueOf() | Throws a TypeError | PlainYearMonth |
| valueOf() | Throws a TypeError | ZonedDateTime |
| values() | Returns an iterator object of the values in an array | Array |
| values() | Returns an iterator object of the values in a DOMTokenList | DOMTokenList |
| values() | Returns an iterator object of the values in a NodeList | HTML NodeList |
| values() | Returns an iterator object of the values in a map | Map |
| values() | Returns an iterator object of the values in an object | Objects |
| values() | Returns an iterator object of the values in a det | Sets |
| values() | Returns an iterator object of the values in a Typed Array | Typed Array |
| var | Declares a variable | Statements |
| warn() | Outputs a warning message to the console | Console |
| watchPosition() | Returns a watch ID value that then can be used to unregister the handler by passing it to the Geolocation.clearWatch() method | Geolocation |
| which | Returns which mouse button was pressed when the mouse event was triggered | MouseEvent KeyboardEvent |
| width | Returns the total width of the screen | Screen |
| with() | Returns an array with updated elements | Array |
| with() | Typed Array | |
| withResolvers() | Promise | |
| with() | Returns a Duration with properties modified | Duration |
| with() | Returns a PlainDate with properties modified | PlainDate |
| with() | Returns a PlainDateTime with properties modified | PlainDateTime |
| with() | Returns a PlainMonthDay with properties modified | PlainMonthDay |
| with() | Returns a PlainTime with properties modified | PlainTime |
| with() | Returns a PlainYearMonth with properties modified | PlainYearMonth |
| with() | Returns a ZonedDateTime with properties modified | ZonedDateTime |
| withCalendar() | Returns a PlainDate in a new calendar system | PlainDate |
| withCalendar() | Returns a PlainDateTime in a new calendar system | PlainDateTime |
| withCalendar() | Returns a ZonedDateTime in a new calendar system | ZonedDateTime |
| withPlainTime() | Returns a PlainDateTime with the time part replaced | PlainDateTime |
| withPlainTime() | Returns a ZonedDateTime with the time part replaced | ZonedDateTime |
| withTimeZone() | Returns a ZonedDateTime with in another time zone. | ZonedDateTime |
| view | Returns a reference to the Window object where the event occurred | Event |
| void | Evaluates an expression and returns undefined | Operators |
| while | Marks a block of statements to be executed while a condition is true | Statements |
| write() | Writes HTML expressions or JavaScript code to a document | HTML Document |
| writeln() | Same as write(), but adds a newline character after each statement | HTML Document |
| yield | Pauses and resumes a generator function | Operators |
| zonedDateTimeISO() | Returns a ZonedDateTime representing the current date and time in the specified time zone | Temporal.Now |
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