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conformance · v136

v136 · deprecate-special-font-size-rules-for-h1-within-some-elements — conformance probe

5 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://github.com/whatwg/html/pull/11102 chromestatus: #6192419898654720 generated 2026-06-01T08:03:56Z by conformance-author-v1-subagent
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id contract kind verdict detail
bare-h1-default-font-size A bare top-level <h1> still renders at the user-agent default font size (the deprecation only targets nested cases). spec ↗ script
h1-in-section-uses-base-h1-size Per the new spec, an <h1> nested in <section> no longer gets a downsized UA style — it matches a bare <h1>. spec ↗ script
h1-in-article-uses-base-h1-size An <h1> nested in <article> matches the bare <h1> font size under the new spec. spec ↗ script
h1-in-aside-uses-base-h1-size An <h1> nested in <aside> matches the bare <h1> font size under the new spec. spec ↗ script
h1-in-nav-uses-base-h1-size An <h1> nested in <nav> matches the bare <h1> font size under the new spec. spec ↗ script