🐛 Use the target's title for [](doc.md#label) links

[dstrodtman]

A path link with empty text to an explicit target in another document resolves to the right anchor but renders no link text:

<!-- other.md -->
(my-label)=
## Labelled heading

<!-- index.md -->
[](other.md#my-label)

On master this renders <a href="other.html#my-label"><span class="std std-ref"></span></a>. Since #1158, which fixed the false-positive myst.xref_missing warning reported in #1151, the link no longer warns, so a build with -W passes with an invisible link. On v5.1.0 the same link warned, so the empty text was visible as a failing build rather than silent.

Cause

resolve_myst_ref_doc sets implicit_text only when the fragment matches a heading slug. The two later branches added in #1158, a section's docutils id and a std-domain label referenced by id or name, set targetid but leave implicit_text empty.

Fix

• The section-id branch takes the title already stored alongside the id in myst_slugs.
• _std_label_id_in_doc becomes _std_label_in_doc and returns the label's section title with its id. Named labels carry a title. Anonymous labels don't.
• When there's still no title, as for an anonymous label on a paragraph or an unresolved id, the link shows the target id as a literal instead of rendering empty. That matches the existing fallback for unresolved [](#target) links in MystReferenceResolver.run.

Explicit link text is unchanged.

Link	master	This PR
[](other.md#my-label), label on a heading	empty	Labelled heading
[](other.md#colon:label), label by name	empty	Colon heading
[](other.md#colon-label), label by id	empty	Colon heading
[](other.md#para-label), anonymous label	empty	para-label
[custom](other.md#my-label)	custom	custom

Tests

• New test_doc_with_target_link_text covers the rows above across two documents with myst_heading_anchors on. Four of its five cases fail on master. The explicit-text case passes on both, as a guard.
• The existing doc_with_target_id and doc_with_target_name fixtures recorded the empty <inline>. They're regenerated and now contain Title.
• Full suite: 1242 passed, 3 failed. The same 3 fail on unpatched master in the same environment: test_cmdline[40-linkify], test_extended_syntaxes, and test_extended_syntaxes_text.
• pre-commit run (ruff, ruff-format, mypy) passes on the changed files.

I didn't add a CHANGELOG.md entry because there's no unreleased section since v5.1.0. Happy to add one if you'd like.

Found while evaluating path links with hand-assigned anchors, [](/page.md#label), as a cross-reference convention for a large Sphinx project mixing MyST and rST.

🤖 Generated with Claude Code

[dstrodtman]

@chrisjsewell PR here is coded by Claude but reviewed by a human. This behavior allows Sphinx MyST to read closer to standard markdown while auto-parsing section/page headers. Motivation is maintainability and making sure raw .md files are friendly to agents.

Please let me know what else I can do to push this forward. Currently in process of converting all OSS Ray docs to MyST, and this would keep me from rigging up my own custom solution there.