[Webkit-unassigned] [Bug 206928] New: Fonts don't render properly with -webkit-font-smoothing: none and spaces

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206928

            Bug ID: 206928
           Summary: Fonts don't render properly with
                    -webkit-font-smoothing: none and spaces
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wesleydesouza at me.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 389132

  --> https://bugs.webkit.org/attachment.cgi?id=389132&action=review

Font rendering sample on a non-retina display

Using -webkit-font-smoothing: none produces incorrect font rendering, full of artifacts that appear to come from a monochrome version of rendering the font with anti-aliasing (see screenshot).

Sometimes not using spaces works, but results are undefined.

Results are more noticeable on a non-retina display, due to larger pixels.

Codepen: https://codepen.io/wessouza/pen/abzrLxO?editors=1100

Tested on:
- Safari Technology Preview Release 99 (Safari 13.2, WebKit 15610.1.1), macOS 10.15.2 (19C57)
- Safari Version 13.0.4 (15608.4.9.1.3), macOS 10.15.2 (19C57)

On two different machines.

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