[css-cascade] !default declarations proposal · Issue #2272 · w3c/csswg-drafts (original) (raw)

!default declarations, opposite to !important declarations, could set a default property value, if it has not been set yet, or if another !default declaration is more specific. User agent styles should be overridden with !default (of course excluding ones with !important).

Consider this example:

.new-theme button { border: thin solid black; }

button { border: 1px dotted grey !default; }

.default-theme button { border: none !default; }

The button would have a thin solid black border in result. Having the !default declaration possible would make it so much easier to do theming or reset CSS.