[Webkit-unassigned] [Bug 243573] New: IntersectionObserver intersectionRatio < 1 observed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243573

            Bug ID: 243573
           Summary: IntersectionObserver intersectionRatio < 1 observed
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zlip.792 at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Hi Team,

Thanks for working continuously to improve Webkit better, I came across a test case while observing Chrome bug related to Intersection Observer and noted that Safari 15.6 and Safari Technical Preview 150 show IntersectionRatio below 1.

Test Case - https://jsfiddle.net/b9we0kh3/show

Chrome Bug - https://bugs.chromium.org/p/chromium/issues/detail?id=1020466

Past Safari Bug similar to this - https://bugs.webkit.org/show_bug.cgi?id=200776

*** STEPS TO REPRODUCE ***

1) Open Test case and note Intersection Ratio

2) Resize and note that it does not show "1" and always stay below "1"

<< EXPECTED RESULT >>

Like other browsers irrespective of window size, "Intersection Ratio remains 1" and do fluctuate when scrolling but it remains at "1"

<< ACTUAL RESULT >>

Safari keep Intersection Ration below 1 while all other browsers keep it at "1"

______

In case, if Safari is right and following spec then please ignore and mark this as "RESOLVED INVALID" and if it is Web-Spec (WHATWG) issue, please raise accordingly.

Thanks

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