Web Reference: 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. Mar 15, 2026 · In JavaScript, window.onload and document.onload handle different loading stages of a web page. Understanding their timing differences is crucial for proper DOM manipulation and event handling. Feb 6, 2026 · Two common approaches for delaying code execution until a page “loads” are `window.onload` and `document.addEventListener ('load')`. At first glance, they might seem interchangeable, but they behave very differently under the hood.
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