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fix(editor): html parsing support for unquoted attributes - #1591

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alex3/rm-16375-support-unquoted-attributes-in-native-html-tags
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fix(editor): html parsing support for unquoted attributes#1591
Alexander6060 wants to merge 3 commits into
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alex3/rm-16375-support-unquoted-attributes-in-native-html-tags

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@Alexander6060

@Alexander6060 Alexander6060 commented Aug 12, 2026

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🎫 Resolve RM-16375

🎯 What does this PR do?

  • Fixes RM-16375 by supporting valid unquoted attribute values on native HTML tags in MDXish, such as <a href=https://example.com>.
  • Prevents URL values from being split into text and autolink nodes.
  • Adds focused regression coverage for MDXish and legacy RMDX parity, tokenizer behavior, and relevant edge cases.

🧪 QA tips

  • In an MDXish page, add <a href=https://example.com>Example</a> and confirm it renders as a link to https://example.com.
  • Confirm unquoted class values work on inline and block tags, such as <span class=example> and <div class=example>.
  • Confirm quoted attributes and existing MDX component attributes continue to render normally.

📸 Screenshot

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between defe477 and 09cf149.

📒 Files selected for processing (2)
  • __tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts
  • __tests__/lib/micromark/mdx-component.test.ts
🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

  • readmeio/ai (manual)
  • readmeio/gitto (manual)
  • readmeio/markdown (manual)
  • readmeio/readme (manual)
🚧 Files skipped from review as they are similar to previous changes (1)
  • tests/lib/micromark/mdx-component.test.ts

Walkthrough

Lowercase MDX components now support qualifying unquoted HTML attribute values. The tokenizer tracks pending values, validates delimiters and incomplete assignments, handles self-closing tags, and applies flow-specific claim rules. Inline lowercase tags can complete after their closing tag. Tests cover MDXish, legacy RMDX, flow and inline tags, malformed assignments, nesting, formatting, and parsed output.

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__tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts

Oops! Something went wrong! :(

ESLint: 8.57.1

Error: Error while loading rule '@vitest/unbound-method': You have used a rule which requires type information, but don't have parserOptions set to generate type information for this file. See https://tseslint.com/typed-linting for enabling linting with type information.
Parser: /node_modules/@typescript-eslint/parser/dist/index.js
Occurred while linting /tests/lib/mdxish/utils/mdxish-component-tag-parser.test.ts
at throwError (/node_modules/@typescript-eslint/utils/dist/eslint-utils/getParserServices.js:40:11)
at getParserServices (/node_modules/@typescript-eslint/utils/dist/eslint-utils/getParserServices.js:29:9)
at create (/node_modules/@typescript-eslint/eslint-plugin/dist/rules/unbound-method.js:138:55)
at Object.create (/node_modules/@typescript-eslint/utils/dist/eslint-utils/RuleCreator.js:39:20)
at create (/node_modules/@vitest/eslint-plugin/dist/index.cjs:6355:35)
at Object.create (/node_modules/@typescript-eslint/utils/dist/eslint-utils/RuleCreator.js:39:20)
at createRuleListeners (/node_modules/eslint/lib/linter/linter.js:895:21)
at /node_modules/eslint/lib/linter/linter.js:1066:110
at Array.forEach ()
at runRules (/node_modules/eslint/lib/linter/linter.js:1003:34)

__tests__/lib/micromark/mdx-component.test.ts

Oops! Something went wrong! :(

ESLint: 8.57.1

Error: Error while loading rule '@vitest/unbound-method': You have used a rule which requires type information, but don't have parserOptions set to generate type information for this file. See https://tseslint.com/typed-linting for enabling linting with type information.
Parser: /node_modules/@typescript-eslint/parser/dist/index.js
Occurred while linting /tests/lib/micromark/mdx-component.test.ts
at throwError (/node_modules/@typescript-eslint/utils/dist/eslint-utils/getParserServices.js:40:11)
at getParserServices (/node_modules/@typescript-eslint/utils/dist/eslint-utils/getParserServices.js:29:9)
at create (/node_modules/@typescript-eslint/eslint-plugin/dist/rules/unbound-method.js:138:55)
at Object.create (/node_modules/@typescript-eslint/utils/dist/eslint-utils/RuleCreator.js:39:20)
at create (/node_modules/@vitest/eslint-plugin/dist/index.cjs:6355:35)
at Object.create (/node_modules/@typescript-eslint/utils/dist/eslint-utils/RuleCreator.js:39:20)
at createRuleListeners (/node_modules/eslint/lib/linter/linter.js:895:21)
at /node_modules/eslint/lib/linter/linter.js:1066:110
at Array.forEach ()
at runRules (/node_modules/eslint/lib/linter/linter.js:1003:34)

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@__tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts`:
- Around line 456-471: Add direct parser-level assertions for unquoted
attributes that verify both flow and text AST output, rather than only the final
MDXish HAST; apply equivalent coverage to the RMDX engine. Extend the regression
cases for RM-16375 to cover malformed assignments, self-closing tags, whitespace
and line-ending variants, forbidden value delimiters, emphasis variants,
escapes, nesting, blank lines, and formatting differences, naming or labeling
the cases with RM-16375.

In `@lib/micromark/mdx-component/syntax.ts`:
- Around line 96-98: Update the comment near inUnquotedAttr to remove the claim
that CommonMark disallows `/` in unquoted HTML attribute values, while retaining
the accurate explanation about lowercase tags, JSX attribute expressions, and
URL handling.
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📒 Files selected for processing (2)
  • __tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts
  • lib/micromark/mdx-component/syntax.ts
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  • readmeio/ai (manual)
  • readmeio/gitto (manual)
  • readmeio/markdown (manual)
  • readmeio/readme (manual)

Comment thread __tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts Outdated
Comment thread lib/micromark/mdx-component/syntax.ts Outdated

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@__tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts`:
- Around line 458-476: The RM-16375 regression matrix is incomplete for emphasis
variants, escaped opening tags, nesting, blank lines, whitespace, and formatting
differences. In
__tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts:458-476, extend
the shared describe.each coverage so every required edge case has explicit
expected output for both MDXish and legacy RMDX. In
__tests__/lib/micromark/mdx-component.test.ts:28-74, add matching assertions for
claim and MDAST behavior in both flow and text contexts, including all required
edge cases.
🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e33c464e-0b5a-458d-95e3-7b891a65d091

📥 Commits

Reviewing files that changed from the base of the PR and between 307c29e and defe477.

📒 Files selected for processing (3)
  • __tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts
  • __tests__/lib/micromark/mdx-component.test.ts
  • lib/micromark/mdx-component/syntax.ts
🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

  • readmeio/ai (manual)
  • readmeio/gitto (manual)
  • readmeio/markdown (manual)
  • readmeio/readme (manual)
🚧 Files skipped from review as they are similar to previous changes (1)
  • lib/micromark/mdx-component/syntax.ts

Comment thread __tests__/lib/mdxish/utils/mdxish-component-tag-parser.test.ts
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