Preserve visible focus, user preferences, and print output. Each lesson makes one concrete CSS decision and names its verification cost.
Lessons
- CSS color and contrast: pair text with its real surface
- CSS focus-visible: keep keyboard location unmistakable
- CSS reduced motion: remove nonessential movement at the source
- CSS transitions and transforms: animate a specific visual property
- CSS dark mode and forced colors: honor distinct user settings
- CSS print styles: preserve the record and remove screen-only controls
- CSS keyframes: keep repeating motion bounded and optional
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Common Mistakes
- Do not carry a sample rule into production without checking its containing markup.
- Do not skip keyboard, zoom, or long-content checks when a visual result looks correct.