[Webkit-unassigned] [Bug 170801] New: Changing text alignment can leave artifacts on fonts that spill outside of the bounding box

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Apr 12 21:08:03 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=170801

            Bug ID: 170801
           Summary: Changing text alignment can leave artifacts on fonts
                    that spill outside of the bounding box
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: steve at suncitydesign.com
                CC: mmaxfield at apple.com

Created attachment 306968

  --> https://bugs.webkit.org/attachment.cgi?id=306968&action=review

Repro.html

It seems that the parts of a glyph that spills outside of the bounding box of an element isn't getting cleaned up when the text alignment is changed.

Steps to reproduce:
1. Open the attached Repro.html file
2. Click the Toggle Alignment button
3. Notice the artifact that remains where the bottom of the J used to be

Reproduced on the following environments:
- Safari Version 10.0.1 (11602.2.14.0.7) on a Macbook Pro
- Safari on iPad Air with iOS 9.0
- Safari on iPad Air with iOS 9.3.2
- Safari on iPad Air with iOS 10.3.2

Unable to reproduce on:
- Google Chrome Version 57.0.2987.133 (64-bit) on a Macbook Pro
- Firefox 52.0.2 (64-bit) on Macbook Pro

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