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CSS :read-only and :read-write selectors

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CSS

:read-only and :read-write pseudo-classes to match elements which are considered user-alterable

Further reading:

  1. Can I use page for: CSS :read-only and :read-write selectors
  2. CSS Tricks article
  3. MDN :read-only
  4. MDN Web Docs - CSS :read-write
  5. Selectors Level 4 ยง The Mutability Pseudo-classes: :read-only and :read-write
  6. Firefox feature request bug