[Webkit-unassigned] [Bug 224324] New: IntersectionObserver with root:document does not trigger callback as expected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224324

            Bug ID: 224324
           Summary: IntersectionObserver with root:document does not
                    trigger callback as expected
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johannes.odland at nrk.no

IntersectionObserver with root:document does not invoke the callback when the target intersects with the root intersection rectangle.

When the intersection root is a document, the root intersection rectangle is the document's viewport.
When a target intersects with the viewport the observer's callback should be invoked, but it is not.


Steps to reproduce:
1: open the following codepen: https://codepen.io/johannesodland/pen/mdRqdxE
2: scroll to the bottom. 

Expected result:
Callback is invoked and background-color of footer/target should be green.

What went wrong?
Callback is not invoked and background-color of footer/target is red.


Both Firefox and Chrome invokes the callback.

Safari now passes the suggested feature-detection for document as intersection root (https://github.com/w3c/IntersectionObserver/issues/372), but fails to invoke callbacks when target is intersecting.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20210408/340c5742/attachment.htm>