[Webkit-unassigned] [Bug 239693] New: Apply layout adjustment for 'text-emphasis' to more languages or fonts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239693

            Bug ID: 239693
           Summary: Apply layout adjustment for 'text-emphasis' to more
                    languages or fonts
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bobbytung at me.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 458218

  --> https://bugs.webkit.org/attachment.cgi?id=458218&action=review

test case with multiple languages and fonts

Hello,

When I tested CSS property 'text-emphasis' in Japanese and Chinese language. I found that layout will be adjust to let the dot above/aside close to base text with certain fonts: Hiragino Mincho and Hiragino Sans. When I changed the value to sesame and circle, some other Japanese fonts may work. But it didn't apply to Traditional Chinese and Simplified Chinese.

Without the layout adjustment, the dot may far away from base text, even make line-height expand with a proper value 1.7 / 1.8.

I'm not sure this behavior related to font, or Webkit had a whitelist to adjust those fonts.

text-emphasis is not only used in Japanese, It's official punctuation in China[1] for Simplified Chinese. And it also occasionally used in Traditional Chinese books published in Taiwan, especially translated from Japanese.

I'd like this layout adjustment able to apply for more language and fonts. 

Regards, 

Bobby

[1]: In China National Standard GB/T 15834—2011.

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