Re: [csswg-drafts] [css-fonts] `system-ui` behavior is undesired for some users (#3658)

> Add a test case like the above (lang attribute sensitiveness) to WPT

Won't work until operating systems fix the issue, as WPT is more focused on browsers/UAs more than operating systems. However it might be a good idea to let the UA vendors to raise bugs/issues towards OS vendors internally..... 🤔

> text or articles (e.g. on some devices running non-Apple operating systems, the glyph shape does not match what the language specified by the lang attribute expects unlike sans-serif).

redundant to "dependent on operating system implementation, which may reference user locale and language settings, and provides varying level of text shaping support". added another example

Fix:

> [!NOTE]
> `system-ui` is dependent on operating system implementation, which may reference user locale and language settings, and provides varying level of text shaping support; this may cause the displayed typeface to be undesirable for some end users *(e.g. Simplified Chinese users might get a monospaced serif font on older version of Windows; `lang` attribute might not affect displayed typeface in cases like `lang=uk` on Russian locale or `lang=ja` on Chinese locale)*. Note that some operating system vendors does not offer means to customise `system-ui`, unlike browser UAs that generally allow users to customise `sans-serif` or `serif` font family. 
> As the name implies, `system-ui` is intended for use with UI elements in web application, and not for large paragraphs of text or articles.

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Received on Thursday, 18 September 2025 14:44:19 UTC