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https://developer.mozilla.org/en-US/blog/using-the-page-visibility-api/
This API exposes a way to determine a document's visibility state so you can check if a web page is "visible" or "hidden
https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Images_media_forms
If you place an image inside a box that is smaller or larger than the intrinsic dimensions of the image file in either direction, it will either appear smaller than the box, or overflow the box
https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Styling_basics/Advanced_styling_effects
The second length value is the vertical offset — the distance downwards that the shadow is offset from the original box (or upwards, if the value is negative)
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
If multiple rules have different selectors that set different values for the same property and target the same element, specificity decides the property value that gets applied to the element
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
https://developer.mozilla.org/zh-TW/docs/Web/Accessibility
Keyboard-navigable JavaScript widgets
Until now, web
developers who want to make their styled <div> and <span> based widgets have lacked the proper techniques