[Webkit-unassigned] [Bug 219013] New: IntersectionObserver with root:document computes subframe intersection incorrectly

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Nov 16 16:46:50 PST 2020


https://bugs.webkit.org/show_bug.cgi?id=219013

            Bug ID: 219013
           Summary: IntersectionObserver with root:document computes
                    subframe intersection incorrectly
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dvoytenko at google.com

(1) Open https://output.jsbin.com/somucum/quiet
(2) Wait for all observations to be reported

This example creates an IntersectionObserver with `{root: top.document}` and observes a target within a same-origin subframe. 

It's expected that such an IntersectionObserver would return observations similar to an intersection observer configured with `{root: null}`. However, as the repro case shows, it currently returns a non-intersecting observation (`intersectionRatio === 0`).

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