[Webkit-unassigned] [Bug 198009] New: Intersection Observer discrepancy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198009

            Bug ID: 198009
           Summary: Intersection Observer discrepancy
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ivanxia at google.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 370170

  --> https://bugs.webkit.org/attachment.cgi?id=370170&action=review

test page to reproduce the issue

Open the attached .html file and go to console, the discrepancy is logged.

When using intersection observe on an inline element, the bounding client rect reported by intersection observer is different from calling element.getBoundingClientRect().

Open the same file using FireFox can confirm the bug.

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