[Webkit-unassigned] [Bug 183029] New: Safari's intrinsic inline-size calculations don't account for nonzero margins on empty children

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183029

            Bug ID: 183029
           Summary: Safari's intrinsic inline-size calculations don't
                    account for nonzero margins on empty children
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dholbert at mozilla.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

STR: Load https://jsfiddle.net/sjap2xxw/

EXPECTED RESULTS: No space between "aaa" and its bottom border.

ACTUAL RESULTS: There's a blank line between "aaa" and its bottom border.

Note: Compare to the second "bbb" example in the testcase (which does not wrap) -- that example only differs from the first example in that we've added some text inside the span. So, this seems to be an issue where Safari is incorrectly disregarding the (nonzero) width of empty children's margin-boxes when it computes the intrinsic inline-size of a container.

Firefox 60 and Edge 16 produce "EXPECTED RESULTS" on that testcase, BTW.
Chrome 66 and Safari 11 produce "ACTUAL RESULTS".

Chrome version of this bug: https://bugs.chromium.org/p/chromium/issues/detail?id=814610

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