[Webkit-unassigned] [Bug 283393] New: iOS 18: CJK characters appear bold with @font-face rule and San Francisco font src

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Nov 19 19:19:03 PST 2024


https://bugs.webkit.org/show_bug.cgi?id=283393

            Bug ID: 283393
           Summary: iOS 18: CJK characters appear bold with @font-face
                    rule and San Francisco font src
           Product: WebKit
           Version: Safari 18
          Hardware: Unspecified
                OS: iOS 18
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com
                CC: fantasai.bugs at inkedblade.net, vitor.roriz at apple.com

Created attachment 473283

  --> https://bugs.webkit.org/attachment.cgi?id=473283&action=review

Sample HTML demonstrating the bug

Steps to reproduce:
1. Open the attached sample HTML file in Safari on iOS 18
2. Click the button "Add @font-face"

Expected results: The text does not appear bold.

Actual results: The CJK characters appear bold. The non-CJK characters do not appear bold. See the attached screenshot.

This bug occurs on iOS 18 but not on iOS 17.

The bug was originally found on www.google.com with the region set to Singapore; the sample HTML was derived from that. My Safari extension StopTheMadness Pro has a font replacement feature that adds @font-face rules to the document.

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