Modern Web Design with HTML5, CSS3, and JavaScript - Loading JavaScript once a Page is Loaded

The video tutorial explains the importance of the DOM loading order in JavaScript. It highlights how placing script tags in the head section can lead to null values when accessing page elements before the body loads. The tutorial introduces the DOMContentLoaded event, which ensures the DOM is fully loaded before executing scripts. It also covers using event listeners with the window object and discusses variable scope, emphasizing the difference between global and block-scoped variables.

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