[Webkit-unassigned] [Bug 176956] New: CSS background gradient and text shadows draw strange after selecting text, closing app, and reopening

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176956

            Bug ID: 176956
           Summary: CSS background gradient and text shadows draw strange
                    after selecting text, closing app, and reopening
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tom.hamming at ymail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 320817

  --> https://bugs.webkit.org/attachment.cgi?id=320817&action=review

Expected appearance

When text shadows and background gradients are applied to a span in a UIWebView in an iOS app, if the app is closed, another app is opened and closed, and the original app is opened again, the gradients often draw with a black background. See screenshots and attached example project.

Steps:

-Run sample project on an iOS device
-Quit the app (press the home button, not force-quit or Xcode stop), open and close at least one other app, and reopen the sample app

Observed: backgrounds (applied here to create a highlight effect in book text) draw black.

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