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Greek letter "Ω" is displayed as Cyrillic letter "и" when bolded in Japanese Windows · Issue #19767 · tailwindlabs/tailwindcss · GitHub

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Greek letter "Ω" is displayed as Cyrillic letter "и" when bolded in Japanese Windows #19767

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Description

What version of Tailwind CSS are you using?

  • 4.2.1
  • 3.4.19
  • (2.2.19)
  • (1.9.6)

What build tool (or framework if it abstracts the build tool) are you using?

Independent

What version of Node.js are you using?

Independent

What browser are you using?

Firefox, Chrome (but independent of browsers)

What operating system are you using?

Windows 11 + Japanese locale

Reproduction URL

https://play.tailwindcss.com/fW1AAohEMz

Describe your issue

  • Use Windows (8.1 or later)
  • Set the system language to Japanese
  • Add a Greek letter Ω
  • Add font-bold class

The default font stack in Tailwind abuses system-ui and causes not a few problems. One of them is a bug in Yu Gothic UI, a system font for Japanese Windows, where the lowercase Cyrillic glyph for "и" is incorrectly assigned to the position of the uppercase Greek letter "Ω" only when in bold. This causes unintelligible display when viewing Greek pages or content related to resistance, regardless of language. w3c/csswg-drafts#3658 (comment)

Although now fixed, Yu Gothic UI had another bug until about six months ago where it unintentionally overlapped consecutive ideographic brackets (「」), leading to nonsensical displays on pages using Tailwind, such as ChatGPT. This forced Chromium to implement a specific fix to mitigate this bug for Yu Gothic.

w3c/csswg-drafts#11074
https://issues.chromium.org/issues/331123676?pli=1

The solution to that is simple: just ditch system-ui from your default font stack. If you only want the best appearance on Apple's OSes, -apple-system and BlinkMacSystemFont are sufficient. If you're unsure about font specifications for a regular page, sans-serif is sufficient. system-ui is a special font specification that truly shines only when your page:

  • Supports various languages,
  • Does not allow manual language changes from the OS language, and
  • Is displayed as part of a desktop application or an OS widget.

Activity

  1. khalidsaidi commented on Mar 25, 2026

  2. RobinMalfait commented on Jul 14, 2026

    Contributor

    Hey! This should be fixed by #20318, and will be available in the next release.

    You can already try it by using the insiders build:
    CLI:

    npm install tailwindcss@insiders @tailwindcss/cli@insiders

    PostCSS:

    npm install tailwindcss@insiders @tailwindcss/postcss@insiders

    Vite:

    npm install tailwindcss@insiders @tailwindcss/vite@insiders

    webpack:

    npm install tailwindcss@insiders @tailwindcss/webpack@insiders
  3. tats-u commented on Jul 16, 2026

    Author

    In Tailwind Play, the font stack for the selected version is not applied, and the one from the latest release is forcibly used instead, but I just tried it and confirmed that the bold Ω is displayed correctly as Ω.

    For reference, I’ll post a screenshot of an example of actual harm. It’ll probably be fixed in a little while. When it is, I’ll take another one and post it again.

    Q. Some title or heading in Greek that starts with Ω

    🤔 I considered proposing Greek titles that start with Ω.

    A. Here are several examples of Greek titles and headings that begin with Ω.

    Word-based

    • Ωδή (Ode, “ode”) — often used in titles of poems or musical pieces
    • Ωκεανός (Ocean, “ocean”) — a grand, mythic-sounding word
    • Ωρα (Hour, “time”) — suitable for titles themed around time or a moment
    • Ωμέγα (Omega, “omega” itself, “end,” “ultimate”) — conveys the sense of a “final chapter” or “ultimate conclusion”

    Phrase / heading style

    • Ω, τι ωραίο! (Oh, how beautiful!) — exclamatory, slogan-like
    • Ωσπερ ο Ήλιος (Like the Sun) — a poetic metaphorical expression
    • Ω Ζωή (Oh Life) — a poetic title in the form of an invocation

    In terms of composition
    Ω is the last letter of the Greek alphabet, so it carries connotations of “end,” “ultimate,” and “completion.” It works especially well for titles that want to suggest a final chapter, the conclusion of a series, or a work themed around the end of time. It is also often paired with α (alpha) in the fixed phrase Από το Α ως το Ω (From Alpha to Omega = “from beginning to end”).

    If you can tell me the context (book title, logo, song name, etc.) where you want to use it, I can give you more specific suggestions.

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