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• Using string literals sparingly
• To determine touch-, mouse- or keyboard input and use it
• Using toggable user preference media features
• Change CSS styles at the root.
• Shadow DOM
• A Vue.js timing hack in component transitions
• The basics of CSS page transitions
• DRY responsive JavaScript
• JavaScript unordered list folding
• Front-end logic without Javascript
• React styled-components and SASS/LESS variables