[Webkit-unassigned] [Bug 191964] New: [css-grid] Resolution of percentage padding/margin is inconsistent for orthogonal writing-mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191964

            Bug ID: 191964
           Summary: [css-grid] Resolution of percentage padding/margin is
                    inconsistent for orthogonal writing-mode
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfernandez at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 355635

  --> https://bugs.webkit.org/attachment.cgi?id=355635&action=review

Test case to reproduce the issue

Check the attached example.
There's a wrapper element with a fixed height of 100px.
Inside it there's an element with a fixed width of 500px.
That element has a vertical element inside (orthogonal) with some content and a margin-top of 10%.

The margin-top should be resolved against the width of the parent, so 10% of 500px is 50px.
The margin-top is computed correctly.
However, the problem comes when computing the available height of the orthogonal element.
We should use the 100px from the wrapper ans subtract the margin-top,
so the height of the orthogonal element should be 50px.
But we're subtracting only 10px (10% of 100px), and setting a 90px height which is wrong.

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