Modern Web Design with HTML5, CSS3, and JavaScript - Quirks Mode in JavaScript

The video tutorial explains quirks mode, a technique used by web browsers to maintain backward compatibility with older web pages. It discusses how browsers use the doctype declaration to decide between quirks and standards mode, emphasizing the importance of including the doctype for HTML5. The tutorial highlights differences between the modes, particularly in styling and page size, and provides examples of quirks mode issues, such as incorrect height calculations. Solutions are offered, including setting height values in CSS. The video concludes with a reference to the Mozilla Developer Network for more information.

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