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:default CSS pseudo-class

95.33

CSS

The `:default` pseudo-class matches checkboxes and radio buttons which are checked by default, `<option>`s with the `selected` attribute, and the default submit button (if any) of a form.

Further reading:

  1. Can I use page for: :default CSS pseudo-class
  2. HTML specification for `:default`
  3. MDN Web Docs - CSS :default
  4. MS Edge feature request on UserVoice
  5. JS Bin testcase
  6. WebKit bug 156230 - `:default` CSS pseudo-class should match checkboxes+radios with a `checked` attribute