Bug 255337 – Fix WebContent crash with null String in font-feature-values

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Matthieu Dubet]

Fix WebContent crash with null String in font-feature-values


Example:

  @font-feature-values "Plex Serif" { 
    @styleset { alt-a: 1; alt-g: 2; } 
    @stylistic { alternates: 1; } 
  }
  @font-feature-values "Dancing Script" { 
    @stylistic { alternates: 1; } 
  }
  .container1 * {
    font-variant-alternates: styleset(alt-a);
  }
  .container1 .script {
    font-variant-alternates: stylistic(alternates);
  }
  .inactive .container1 * {
    font-variant-alternates: normal;
  }


https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Fonts/OpenType_fonts_guide

[Matthieu Dubet]

rdar://107758556

[Matthieu Dubet]

Pull request: https://github.com/WebKit/WebKit/pull/12652

[EWS]

Committed 262880@main (3ac8b5512c4d): <https://commits.webkit.org/262880@main>

Reviewed commits have been landed. Closing PR #12652 and removing active labels.