[Webkit-unassigned] [Bug 180073] All text should enable tracking, not just system-ui

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180073

--- Comment #6 from zhouqi <zhouqicf at gmail.com> ---
(In reply to Myles C. Maxfield from comment #4)
> We enable advanced text tracking with system-ui, but don't enable it for
> other fonts (like PingFang). This is because of performance. The color of
> all the text in the screen shot you provided is pure black (#000000) - I
> verified this by opening the screenshot in Photoshop. The weight of the
> Chinese characters is the same between the two lines, and the weight of the
> English text is different between the two lines because different fonts are
> being used to render the English text on the two lines.

Sorry, the difference of color and font-weight my sensory judgment. 

So how about the word spacing? This is the biggest problem.

In addition, if the system-ui is for english only, what is your suggestion? In environments other than English, we should use other fonts for English display? I think this will cause the English display different in native app between web page.

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