[Webkit-unassigned] [Bug 170772] New: Getting snapshot of WKWebView fails ImageDiff tests

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Apr 12 09:05:01 PDT 2017


            Bug ID: 170772
           Summary: Getting snapshot of WKWebView fails ImageDiff tests
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jbedard at apple.com

When testing, WebKit will frequently take a snapshot of the current WKWebView and compare it to some expected value.  While developing this functionality for on-device testing (https://bugs.webkit.org/show_bug.cgi?id=169421), it was suggested that the snapshotting API should be used.  I have attached test results from this run.  For 6 of the tests, the snapshotting API does not give the expected result.  Looking at the results, expected results and the screen of the device while running the tests, this seems to be a bug in the snapshotting API.  I think compositing/regions/position-layers-inside-region-overflow-hidden.html demonstrates this most clearly.

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