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fix(parse): preserve SVG and MathML element name casing - #469
adamdehaven wants to merge 5 commits into
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Keep the author's case for attribute names inside SVG and MathML, and apply the HTML standard's case adjustment to their element names. Names outside foreign content stay lowercase, so viewBox and linearGradient now reach framework renderers intact. Inline HTML fragments are parsed one tag at a time, so the token processor passes the SVG/MathML context to each fragment. With that context, self-closed foreign elements such as <path/> are void, and closing tags with hyphens match their opener. Keep the first of case-variant duplicate attributes, as browsers do. Drop outerHTML from rendered attributes and reject it in the security plugin, because Vue sets it as a DOM property and a re-render then injects markup. Fixes comarkdown#467
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Architecture 
6 components touched across 2 lanes. Play the interactive walkthrough Inside the changed components — 2 viewsComponent view — Foreign content parsing HTML tag parser and token processor preserve SVG and MathML casing and self-closing tags 
Component view — DOM sink protection Props validation and attribute resolution drop outerHTML to prevent DOM sink XSS 
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📝 Walkthrough
Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The changed rendering path blocks outerHTML props, including case variants and bindings, and this review did not establish a new attack path. Other rendering configurations have not been fully assessed, so the risk is not rated minimal. Retained concerns Security review details
Pre-merge checks:
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
Issue [#467] requires correctly cased SVG element and attribute names, while ordinary HTML element names remain lowercase. normalizeName in packages/comark/src/internal/parse/utils.ts applies one … |
Implement context-aware SVG and MathML name adjustment for inline and block parsing. Map foreign element and attribute names to the HTML-standard forms, including linearGradient and viewBox. Lowercase ordinary HTML element names outside… |
| Out of Scope Changes check | |
The outerHTML changes in packages/comark/src/internal/props-validation.ts, packages/comark/src/internal/stringify/attributes.ts, the security documentation, and renderer and security tests add i… |
Remove the outerHTML implementation, documentation, and tests from this PR, or move them to a separate PR linked to an active security issue. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly describes the primary parser change: preserving SVG and MathML element name casing. It is concise and specific. Docstring Coverage Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 11 files. (2 skipped: 2…
Full details: Linked Issues check
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Explanation
Issue [
#467] requires correctly cased SVG element and attribute names, while ordinary HTML element names remain lowercase.normalizeNameinpackages/comark/src/internal/parse/utils.tsapplies one global all-uppercase rule and has no SVG or MathML context. ThereforeLINEARGRADIENTbecomeslineargradientandVIEWBOXbecomesviewbox, instead of the foreign-content adjustments required by the issue. The test inpackages/comark/test/svg-case.test.tsasserts this incorrect behavior. The same rule also preserves mixed-case ordinary HTML names such asHello, which conflicts with the linked issue requirement that HTML names remain lowercase.Resolution
Implement context-aware SVG and MathML name adjustment for inline and block parsing. Map foreign element and attribute names to the HTML-standard forms, including
linearGradientandviewBox. Lowercase ordinary HTML element names outside foreign content. Add tests for the required foreign adjustments and for lowercase ordinary HTML names.
Full details: Out of Scope Changes check
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Explanation
The
outerHTMLchanges inpackages/comark/src/internal/props-validation.ts,packages/comark/src/internal/stringify/attributes.ts, the security documentation, and renderer and security tests add independent DOM-sink hardening. Issue [#467] requests SVG and MathML name handling. It does not require blockingouterHTML, and the PR description states that this sink was already reachable before the casing change.
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comark
@comark/angular
@comark/ansi
@comark/html
@comark/nuxt
@comark/react
@comark/svelte
@comark/vue
commit: |
📦 Bundle size snapshot is out of dateThe published size of one or more packages changed, so the inline snapshot in Please review the diff below. If the change is expected, accept the new snapshot:
Only maintainers with write access can trigger the update. You can also comment Bundle size diff FAIL test/bundle.test.ts > package bundle size > published size of each package
Error: Snapshot `package bundle size > published size of each package 1` mismatched
- Expected
+ Received
@@ -4,7 +4,7 @@
"@comark/html": "16.5k (58 files)",
"@comark/nuxt": "11.9k (58 files)",
"@comark/react": "38.0k (76 files)",
"@comark/svelte": "45.8k (84 files)",
"@comark/vue": "56.2k (80 files)",
- "comark": "384k (152 files)",
+ "comark": "385k (152 files)",
}
❯ test/bundle.test.ts:61:20
59| }
60|
61| expect(report).toMatchInlineSnapshot(`
| ^
62| {
63| "@comark/angular": "56.2k (72 files)",
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/1]⎯ |
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@farnabaz this should be ready for review |
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Inline comments:
Review comments at @packages/comark/src/internal/parse/utils.ts:
- Around line 210-229: Update isHtmlIntegrationPoint to find the annotation-xml
encoding attribute without regard to the preserved key casing, then compare its
string value case-insensitively with the supported HTML MIME types. Leave
foreign-attribute preservation unchanged.
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📒 Files selected for processing: 10
AGENTS.mddocs/content/4.plugins/0.defaults/html.mddocs/content/4.plugins/1.built-in/security.mdpackages/comark/SPEC/HTML/svg-block.mdpackages/comark/SPEC/HTML/svg.mdpackages/comark/src/internal/parse/tree.tspackages/comark/src/internal/parse/utils.tspackages/comark/test/plugins/security.test.tspackages/comark/test/resolve-attributes.test.tspackages/comark/test/svg-case.test.ts
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- packages/comark/SPEC/HTML/svg.md
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Inline comments:
Review comments at @packages/comark/src/internal/parse/utils.ts:
- Line 201: Update the tag-name handling around normalizeTagName to map
recognized SVG element names, including lineargradient, to their HTML-standard
casing when parsing SVG foreign content; update the related test expectation to
use the corrected name.
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AGENTS.mddocs/content/4.plugins/0.defaults/html.mdpackages/comark/src/internal/parse/utils.tspackages/comark/test/svg-case.test.ts
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Thanks for this, @adamdehaven!
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So is this PR no longer needed? @farnabaz feel free to close if this is resolved 🚀 |
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@adamdehaven I think we still need it to fix whole issue |
I tested a SVG in the playground, and seems to work ok |
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Thanks for the PR the PR and check @adamdehaven 🙏 |
Fixes #467
SVG and MathML names are case-sensitive, but Comark lowercased them. Client-side renderers then built
viewboxandlineargradient, which the browser ignores, so icons render at the wrong size or without gradients. Attribute names now keep the author's case inside SVG and MathML. Element names get the HTML standard's SVG/MathML case adjustment from htmlparser2, soLINEARGRADIENTbecomeslinearGradientand there is no element map. HTML names outside foreign content stay lowercase, and<Hello>still becomeshello.Inline HTML reaches the parser one tag at a time, so the token processor now passes the SVG/MathML context to each fragment. Two related fixes follow from that context: self-closed foreign elements such as
<path/>no longer swallow their siblings, and closing tags with hyphens (</annotation-xml>, custom elements) now match their opener. Because the parser no longer lowercases attribute names, case-variant duplicates keep the first occurrence, as browsers do (<a href="/safe" HREF="javascript:...">keeps/safe).Note
Security:
outerHTMLis added to the props that framework renderers never forward and that the security plugin rejects. Vue sets it as a DOM property on HTML elements, so a re-render with a changed value injects markup. It was already reachable through[x]{outerHTML="..."}, and case preservation added a path through<foreignObject>. The security docs list it now.A blank line inside an SVG still ends the HTML block, per the CommonMark rule, so later elements land outside the
<svg>. This is unchanged frommainand out of scope; keep inline SVG free of blank lines.Tests cover inline and block SVG/MathML casing, case adjustment of wrongly cased names, self-closing, duplicate attributes, hyphenated closing tags, headings, streaming, and round-trips, plus the
outerHTMLsink in the renderer floor, the security plugin, and the Vue renderer. New SPEC fixtures:SPEC/HTML/svg.mdandSPEC/HTML/svg-block.md.Summary by CodeRabbit
Security
outerHTMLattributes and bindings, including case variants, to prevent unsafe HTML injection.Features
Documentation