fix(biome_html_analyze): treat paired-tag components as content in useAnchorContent by necofuryai · Pull Request #11876 · biomejs/biome

necofuryai · 2026-09-21T14:29:56Z

Summary

useAnchorContent now recognizes custom components with explicit closing tags through the existing is_custom_component() check. For example, <a><CustomIcon></CustomIcon></a> is now accepted.

Astro's Image is handled separately: paired Image elements use the same accessible-name and alt checks as self-closing ones. Their children do not count as accessible content because Astro does not render them. For example, <a><Image alt="">Home</Image></a> is now reported.

The existing aria-hidden check and self-closing branch are unchanged.

Test Plan

Added valid paired-tag component cases for Astro, Vue, and Svelte.
Added valid paired Astro Image cases with non-empty alt, or empty alt supplemented by aria-label or {title}.
Added invalid paired Astro Image cases with missing or empty alt, including a case whose child text is not rendered.
Updated and reviewed the corresponding snapshots.
Claude Code's local run of INSTA_UPDATE=no cargo test -p biome_html_analyze reported 72 unit tests passed with 1 ignored, and 639 spec tests passed, with no failures.

Docs

A patch changeset is included.

AI assistance

The implementation, test fixtures and snapshots, and changeset were written by Claude Code.

…eAnchorContent

agentscanapp · 2026-09-21T14:30:00Z

A maintainer will take a look as soon as they can. In the meantime, please make sure that:

the description follows our PR template
any related issues are linked
existing tests still pass

changeset-bot · 2026-09-21T14:30:00Z

🦋 Changeset detected

Latest commit: 9037163

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@biomejs/biome	Patch
@biomejs/cli-darwin-arm64	Patch
@biomejs/cli-darwin-x64	Patch
@biomejs/cli-linux-arm64-musl	Patch
@biomejs/cli-linux-arm64	Patch
@biomejs/cli-linux-x64-musl	Patch
@biomejs/cli-linux-x64	Patch
@biomejs/cli-win32-arm64	Patch
@biomejs/cli-win32-x64	Patch
@biomejs/wasm-bundler	Patch
@biomejs/wasm-nodejs	Patch
@biomejs/wasm-web	Patch
@biomejs/backend-jsonrpc	Patch

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coderabbitai · 2026-09-21T14:33:50Z

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crates/biome_html_analyze/tests/specs/a11y/useAnchorContent/astro/invalid.astro.snap is excluded by !**/*.snap and included by **
crates/biome_html_analyze/tests/specs/a11y/useAnchorContent/astro/valid.astro.snap is excluded by !**/*.snap and included by **

📒 Files selected for processing (4)

.changeset/use-anchor-content-paired-component-tags.md
crates/biome_html_analyze/src/lint/a11y/use_anchor_content.rs
crates/biome_html_analyze/tests/specs/a11y/useAnchorContent/astro/invalid.astro
crates/biome_html_analyze/tests/specs/a11y/useAnchorContent/astro/valid.astro

🚧 Files skipped from review as they are similar to previous changes (3)

crates/biome_html_analyze/src/lint/a11y/use_anchor_content.rs
crates/biome_html_analyze/tests/specs/a11y/useAnchorContent/astro/valid.astro
.changeset/use-anchor-content-paired-component-tags.md

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Walkthrough

The useAnchorContent rule now checks paired Astro Image elements for a non-empty aria-label, aria-labelledby, title, or alt attribute. Other custom components remain accepted without further validation. Astro fixtures cover valid and invalid paired Image cases. Vue and Svelte fixtures cover paired custom components. A patch changeset documents the change.

Possibly related PRs

biomejs/biome#8769: Introduced the useAnchorContent rule and its accessible-content checks.

Priority: ⬇️ Low

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to 90371

The change adds paired-component handling and framework fixtures. No actionable merge-blocking issue is established; risk is minimal, subject to normal checks.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The implementation updates `has_accessible_content` to accept paired custom components through `is_custom_component()`, matching self-closing syntax. It retains explicit Astro `Image` attribute checks…
Out of Scope Changes check	✅ Passed	The rule change, focused Astro, Vue, and Svelte fixtures, and patch changeset all support issue `#11872`. The excluded Astro snapshots are generated test artefacts and do not indicate an unrelated chang…
Title check	✅ Passed	The title clearly and concisely describes the main change: paired-tag components are treated as content by the `useAnchorContent` rule.
Description check	✅ Passed	The description directly explains the implementation, Astro-specific behaviour, tests, snapshots, and changeset. It is fully related to the changeset.

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ematipico · 2026-09-21T14:37:27Z

+fn html_element_renders_accessible_content(element: &HtmlElement, is_astro: bool) -> bool {
+    let Some(tag_text) = element
+        .opening_element()
+        .ok()
+        .and_then(|opening| opening.name().ok())
+        .and_then(|name| name.token_text_trimmed())
+    else {
+        return false;
+    };
+
+    let name = tag_text.as_ref();
+
+    if name.eq_ignore_ascii_case("img") || (is_astro && name == "Image") {
+        return html_element_has_non_empty_attribute(element, "alt");
+    }
+
+    // Custom components (PascalCase) may render accessible content
+    name.starts_with(|c: char| c.is_uppercase())
+}


This is not the expected fix. Please align the implementation of the fix with the JSX rule.

Thanks for the feedback. In e1907b6, I replaced the additional helpers with the existing is_custom_component() check, following the JSX rule's approach to custom components.

One detail I'd like to clarify: this also accepts <a><Image></Image></a> without alt in Astro, while <a><Image /></a> is still reported by the unchanged self-closing branch. CodeRabbit flagged this difference. Should I retain the Astro-specific alt check for paired Image elements as well?

I'd like to withdraw my earlier question about retaining an alt check for paired Astro Image elements. The existing Image-specific alt check is in the self-closing branch, which this PR leaves unchanged. The paired-tag branch previously checked aria-hidden and then recursed into the element's children; it had no Image-specific alt check. <a><Image></Image></a> was reported before only because that recursion finds no children — the same path that produces the #11872 false positive.

For element children, the JSX rule's is_accessible_node (biome_js_syntax/src/jsx_ext.rs) evaluates is_custom_component() || !has_truthy_attribute("aria-hidden"): custom components are accepted without evaluating aria-hidden, while non-custom elements depend on that attribute. There is no Image-specific alt check in this logic. This PR retains the HTML branch's existing aria-hidden check before accepting paired custom components.

Accepting paired Image elements follows the JSX rule's approach to custom components. I'll keep this fix focused on that behavior.

There is no Image-specific alt check in this logic

Because we didn't have Astro before. Now we do, so we should adhere to its behaviour

Understood. In 9037163, paired Astro Image elements now use the same checks as the self-closing form, without counting their children as accessible content. I added regression tests covering missing and empty alt, the {title} shorthand, and ignored children. INSTA_UPDATE=no cargo test -p biome_html_analyze passes.

…th the JSX rule

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Inline comments:
In `@crates/biome_html_analyze/src/lint/a11y/use_anchor_content.rs`:
- Around line 190-194: Update the custom-component handling in the anchor
content validation to detect paired Astro Image elements before treating a
component as accessible content. Ensure Image elements still undergo alt
validation, including diagnostics for missing and empty alt values, while
preserving the existing bypass for other custom components; add paired test
cases covering both invalid Image alt scenarios.

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…ng spelling

codspeed · 2026-09-23T22:53:11Z

Merging this PR will not alter performance

✅ 65 untouched benchmarks
⏩ 293 skipped benchmarks¹

_{Comparing necofuryai:fix/use-anchor-content-paired-component-tags (9037163) with main (3260602)²}

293 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
No successful run was found on main (3841c26) during the generation of this report, so 3260602 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

fix(biome_html_analyze): treat paired-tag components as content in us…

98fcd06

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github-actions Bot added A-Linter Area: linter L-HTML Language: HTML and super languages labels Sep 21, 2026

ematipico requested changes Sep 21, 2026

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refactor(biome_html_analyze): align the paired-tag component check wi…

e1907b6

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Comment thread crates/biome_html_analyze/src/lint/a11y/use_anchor_content.rs Outdated

necofuryai requested a review from ematipico September 21, 2026 21:05

fix(biome_html_analyze): check paired Astro Image like the self-closi…

9037163

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fix(biome_html_analyze): treat paired-tag components as content in useAnchorContent - #11876

fix(biome_html_analyze): treat paired-tag components as content in useAnchorContent#11876
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