CSS Complexity PhD. (2026)

CSS PHD

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• CSS: Length Units

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• CSS: nesting selector (ampersand &)

• CSS: complex selector (combinators)
• CSS: compound selectors
• CSS: pseudo-class function selector
• CSS: is any of selector (:is, :where)
• CSS: :has descendant selector
• CSS: ::marker (for list item)

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• CSS: color scheme
• CSS: touch-action (phone screen)

• CSS: Flexbox Layout