[Webkit-unassigned] [Bug 247481] New: white-space: break-spaces sometimes treats element boundaries before spaces as breaking opportunities

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247481

            Bug ID: 247481
           Summary: white-space: break-spaces sometimes treats element
                    boundaries before spaces as breaking opportunities
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: abotella at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 463398

  --> https://bugs.webkit.org/attachment.cgi?id=463398&action=review

Test case for this bug

The `white-space: break-spaces` CSS property should not hang or collapse spaces, and should only allow breaking after spaces rather than before them. But it seems like in Webkit, in some cases an element boundary before a space can collapse or hang the space, even when that element does not change the `white-space` property with respect to its parent.

In the attachment test, notice that there is no space at the start of the second line before "BB", which means either the space after "AAAA" overflowed, or it collapsed or hanged. However, "C " is allowed to overflow and doesn't here, so the space does not seem to be considered for line-breaking purposes, when it should.

This is an issue considered for the "web compat" part of Interop 2023 (https://github.com/web-platform-tests/interop/issues/187), which was initially reported as a bug in Chromium before I noticed Webkit also has a related bug.

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