Intent to implement and ship: flow-relative values for resize property

[Xidorn Quan]

Summary: Add two values "block" and "inline" to resize property.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1464786

Link to standard: https://drafts.csswg.org/css-logical/#resize

Platform coverage: All platforms

Estimated or target release: 63

Preference behind which this will be implemented: No

Is this feature enabled by default in sandboxed iframes? Yes

DevTools bug: No extra tooling needed.

Do other browser engines implement this?
Chrome: intent to implement https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/48OwfwZrbvI/A1XZFGkzAwAJ
Edge: considering https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/7438435-css-logical-properties

web-platform-tests:
A web-platform-test from Chrome's implementation is being added: https://github.com/web-platform-tests/wpt/pull/12326

Is this feature restricted to secure contexts? No, because it is a simple extend to an existing property.