Web Reference: Mar 27, 2026 · To avoid running a script before the DOM it manipulates has been fully constructed, you can place the script at the end of the document body, immediately before the closing tag, without wrapping it in an event listener. You should usually only use the load event to wait for external resources, such as images or deferred scripts, to load. Learn how to use the onload event to execute a script once a web page has completely loaded all content. See examples of how to check browser type, deal with cookies, and more. Feb 25, 2009 · The general idea is that window.onload fires when the document's window is ready for presentation and document.onload fires when the DOM tree (built from the markup code within the document) is completed.
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