[Webkit-unassigned] [Bug 195180] New: [css-values-4] Support font-relative lh and rlh unit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195180

            Bug ID: 195180
           Summary: [css-values-4] Support font-relative lh and rlh unit
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: browserbugs2 at gtalbot.org

CSS4 Values and Units, section 6.1.1 Font-relative lengths: the lh, rlh units
https://www.w3.org/TR/css-values-4/#font-relative-lengths
states

"
lh unit
    Equal to the computed value of the line-height property of the element on which it is used, converting normal to an absolute length by using only the metrics of the first available font. 

rlh unit
    Equal to the computed value of line-height property on the root element, converting normal to an absolute length as above.
"

Tests
-----

http://w3c-test.org/css/css-values/lh-rlh-on-root-001.html

http://w3c-test.org/css/css-values/lh-unit-001.html

http://w3c-test.org/css/css-values/lh-unit-002.html


Test results
- - - - - -

https://wpt.fyi/results/css/css-values?label=master

So far, no browser pass these 3 tests.


Correspondent Bugzilla Mozilla bug report:
https://bugzilla.mozilla.org/show_bug.cgi?id=1310170

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