HTML onload Attribute

Definition and Usage

The onload attribute fires when an object has been loaded.

onload is most often used within the <body> element to execute a script once a web page has completely loaded all content (including images, script files, CSS files, etc.). However, it can be used on other elements as well (see "Supported HTML tags" below).

For input elements, the onload attribute is only supported when <input type="image">

The onload attribute can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information.

Applies to

The onload attribute is part of the Event Attributes, and can be used on the following elements:



Body Example

Execute a JavaScript immediately after a page has been loaded:

<body onload="myFunction()">
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Img Example

Using onload on an <img> element. Alert "Image is loaded" immediately after an image has been loaded:

<img src="w3html.gif" onload="loadImage()" width="100" height="132">

function loadImage() {
    alert("Image is loaded");
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Browser Support

The onload attribute has the following browser support for each element:

body Yes Yes Yes Yes Yes
iframe Yes Yes Yes Yes Yes
img Yes Yes Yes Yes Yes
link Yes Yes Yes Yes Yes
script Yes Yes Yes Yes Yes
style Yes Yes Yes Yes Yes