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alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex
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HTML Objects

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Other References

CSSStyleDeclaration JS Conversion

HTML DOM setAttribute() Method

❮ Element Object


Add the class attribute with the value of "democlass" to a <h1> element:

document.getElementsByTagName("H1")[0].setAttribute("class", "democlass");

Before setting the attribute:

Hello World

After setting the attribute:

Hello World

Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The setAttribute() method adds the specified attribute to an element, and gives it the specified value.

If the specified attribute already exists, only the value is set/changed.

Note: Although it is possible to add the style attribute with a value to an element with this method, it is recommended that you use properties of the Style object instead for inline styling, because this will not overwrite other CSS properties that may be specified in the style attribute:


element.setAttribute("style", "background-color: red;");


element.style.backgroundColor = "red";

Tip: Use the removeAttribute() method to remove an attribute from an element.

Tip: See also the setAttributeNode() method.

Browser Support

The numbers in the table specify the first browser version that fully supports the method.

setAttribute() Yes 8.0 Yes Yes Yes


element.setAttribute(attributename, attributevalue)

Parameter Values

Parameter Type Description
attributename String Required. The name of the attribute you want to add
attributevalue String Required. The value of the attribute you want to add

Technical Details

Return Value: No return value
DOM Version Core Level 1 Element Object

More Examples


Change an input field to an input button:

document.getElementsByTagName("INPUT")[0].setAttribute("type", "button");

Before setting the attribute:

After setting the attribute:

Try it Yourself »


Add a href attribute with a value of "www.w3schools.com" to an <a> element:

document.getElementById("myAnchor").setAttribute("href", "https://www.w3schools.com");

Before setting the attribute:

Go to w3schools.com

After setting the attribute:

Try it Yourself »


Find out if an <a> element has a target attribute. If so, change the value of the target attribute to "_self":

// Get the <a> element with id="myAnchor"
var x = document.getElementById("myAnchor"); 

// If the <a> element has a target attribute, set the value to "_self"
if (x.hasAttribute("target")) {      
  x.setAttribute("target", "_self");
Try it Yourself »

Related Pages

HTML Tutorial: HTML Attributes

HTML DOM Reference: getAttribute() Method

HTML DOM Reference: hasAttribute() Method

HTML DOM Reference: removeAttribute() Method

❮ Element Object