Intent to Implement and Ship: CSS border-{block,inline}-{color,style,width} and border-{block,inline} shorthands

[Mats Palmgren]

Summary:
The border-{block,inline}-{color,style,width} CSS properties are shorthand
for their respective -start/-end properties.
The border-{block,inline} are shorthand for their respective -start/-end
shorthands, though you can only specify one value (which is used on both
the -start/-end sides).

Bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1520236
https://bugzilla.mozilla.org/show_bug.cgi?id=1520396

Link to standard:
https://drafts.csswg.org/css-logical/#propdef-border-inline-color (etc)
https://drafts.csswg.org/css-logical/#propdef-border-inline

Platform coverage: All platforms

Estimated or target release: Firefox 66

Preference behind which this will be implemented: None

Is this feature enabled by default in sandboxed iframes? Yes

DevTools bug: N/A, devtools support is included in these patches

Do other browser engines implement this?
https://wpt.fyi/results/css/css-logical/logical-box-border-shorthands.html

web-platform-tests:
http://w3c-test.org/css/css-logical/logical-box-border-shorthands.html

Is this feature restricted to secure contexts? No


/Mats

[Mats Palmgren]