More "Try it Yourself" examples below.
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).
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.
The onload attribute can also be used to deal with cookies (see "More Examples" below).
|script||The script to be run on onload|
|Supported HTML tags:||<body>, <frame>, <frameset>, <iframe>, <img>, <input type="image">, <link>, <script> and <style>|
Using onload on an <img> element. Alert "Image is loaded" immediately after an image has been loaded:
HTML DOM reference: onload event