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https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Attributes/aria-disabled
Web developers must manually ensure such elements have their functionality suppressed when exposed to the disabled state
https://developer.mozilla.org/en-US/blog/using-the-page-visibility-api/
A page changing to a hidden state might be the last event that's observable by a page, so developers often treat it as the end of the user's session
https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Images_media_forms
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https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Advanced_styling_effects
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https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting/Debugging_JavaScript
Learning outcomes:
Using browser developer tools to inspect the JavaScript running on your page and see what errors it is generating
https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Handling_conflicts
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https://developer.mozilla.org/en-US/docs/Web/CSS/Guides
CSS custom functions and mixins
The CSS custom functions and mixins module allows developers to create reusable blocks of CSS code that can accept arguments, contain complex logic (defined using features such as CSS if() functions and @media at-rules), and return values based on that logic