[Webkit-unassigned] [Bug 203688] New: [iOS] Text selection escapes overflow clip

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203688

            Bug ID: 203688
           Summary: [iOS] Text selection escapes overflow clip
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 382482

  --> https://bugs.webkit.org/attachment.cgi?id=382482&action=review

Screenshot

When text is selected inside an overflow:scroll element, and then that scroller is scrolled so that the selected text is no longer visible, the selection highlight is still drawn, outside the clip.

For example:
1. Visit https://jsfiddle.net/s82hfLkn/1/show.
2. Select "Hello" and then scroll the pink scrolling div.
3. Wait until the div has stopped moving.

At this point, the selection highlight will be drawn above the div, even though the selected text is now clipped out. See the attached screenshot.

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