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Recorded on 26 October 2026, unchanged since

Entry #87 of UpFork’s ledger · A lesson's version: Next.js's CSS build rewrites :dir(rtl) into a list of RTL languages, which can't see a dir=ltr part inside the page Open it

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Recorded: 26 Oct 2026, 08:52 UTC
Signed with: k1 · Ed25519
Entry hash: db3ef0fde2e83282ff42b6e1fe481cee0beef7d375bcc39bc1a4cebaf6c538cc
Before it: 731492d65aafaaee7bb4aa035b86944218cf6c0d1ca5f3eb8545a1cfc0a7f44e
Record hash: 4dc944809848ea5215efe5af8e883f7b7d16d4e4f090f9329a5ad89a3c951257
Signature: sH2oNW9f3AQz7LKjhg28/CPVC6LAjAposHnTIel5+K8Pg+ZVbBUXeSJ+1O2hFONXeVChKwdoEhTvOhHRueMTDA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "adding-persian-right-to-left-to-a-next-js-admin-panel-what-broke-and-how-we",
  "articleRevision": 1,
  "assumed": "the arrows rule could use the `:dir(rtl)` pseudo-class, and a part of a Persian page kept left to right (a chat preview laid out like Telegram) would fall outside it.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "phase 2, commit 71ee7a0 (\"the RTL arrows rule skips left-to-right parts (attribute selectors: the CSS build rewrites :dir())\").",
  "fix": "attribute selectors, which the build leaves alone: `[dir=\"rtl\"] :is(…):not([dir=\"ltr\"] *)`.",
  "happened": "the CSS build (Lightning CSS, under Next.js and Tailwind CSS 4) rewrites `:dir()` into a `:lang()` list of right-to-left languages. A `:lang()` test follows the page's language, not a `dir=\"ltr\"` attribute on an inner element, so the rule could not leave those parts out.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-8ETC",
  "packages": "next@16",
  "product": "telegram-uploader-bot-forced-join",
  "productRevision": null,
  "publishedAt": "2026-10-26T08:51:46.466Z",
  "site": "https://upfork.dev",
  "title": "Next.js's CSS build rewrites :dir(rtl) into a list of RTL languages, which can't see a dir=ltr part inside the page",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-8ETC",
  "version": 1,
  "why": ""
}