Would be great, especially for developers of extensions and third-party scripts, to add support for the "all" shorthand property (e.g. "all: initial" or "all: default").
Seconded. With Safari extensions, injected stylesheets are treated as "user stylesheets", so any "general" styles on the host site (e.g., h3{padding:none} ) takes precedence over injected style declarations, even if the injected style declarations have higher specificity. Implementing the `all` property in WebKit will open the doors for more reliably-styled Safari extensions.
Update: This feature shipped in Firefox 27 (10/2013), Chrome 37 (06/2014), Opera 24. Other browser issue links: https://code.google.com/p/chromium/issues/detail?id=172051 https://bugzilla.mozilla.org/show_bug.cgi?id=842329 MDN page: https://developer.mozilla.org/en-US/docs/Web/CSS/all
Created attachment 263270 [details] Patch
Landed in r191178.
<rdar://problem/23771229>