[Webkit-unassigned] [Bug 209264] New: Intersection Observer intersections are wrong with zooming

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209264

            Bug ID: 209264
           Summary: Intersection Observer intersections are wrong with
                    zooming
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 393934

  --> https://bugs.webkit.org/attachment.cgi?id=393934&action=review

Test

Working with intersection Observer I have found an issue when zoom is changed.
I have created an html file to demonstrate attached here.

Steps To Reproduce:
1. Open HTML file with included JS code 
2. Scroll down the page and notice how square change color when the top of the square touches the top of the viewport.
3. Change the Zoom level 
4. Scroll again to see how the squares change color at a different timing (not top of square with top of viewport).

Results:

In Chrome regardless of the zoom level the squares change color when the top of the square touches the top of the viewport.

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