[Webkit-unassigned] [Bug 182287] New: Rewrite fast/events/scroll-in-scaled-page-with-overflow-hidden.html to conform with CSSOM View

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182287

            Bug ID: 182287
           Summary: Rewrite
                    fast/events/scroll-in-scaled-page-with-overflow-hidden
                    .html to conform with CSSOM View
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: lforschler at apple.com
            Blocks: 5991

fast/events/scroll-in-scaled-page-with-overflow-hidden.html uses document.body.scrollTop to retrieve the vertical scroll offset of the viewport. This currently works because WebKit does not follow the CSSOM View spec (bug 5991). However, when CSSOMViewScrollingAPI is enabled, the HTML body is potentially scrollable (html, body have overflow: hidden see [1]) so document.body.scrollTop does not return the scroll offset [2]. Instead, the corresponding Chromium test [3] relies on internals.visualViewportScrollY().

[1] https://drafts.csswg.org/cssom-view/#potentially-scrollable
[2] https://drafts.csswg.org/cssom-view/#dom-element-scrolltop
[3] https://cs.chromium.org/chromium/src/third_party/WebKit/LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html?q=scroll-in-scaled-page-with-overflow-hidden.html&sq=package:chromium&dr


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=5991
[Bug 5991] [CSSOM View] Implement standard behavior for scroll(Left/Top/Width/Height/To/By/ingElement)
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