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When an <h1> is inside an element like <section>, it is treated like a header of that section and is styled relative to the section rather than the whole page. However, if any of the other headers are used in the same way, they are only styled relative to the page. If, for example, an <h1> and <h2> are within an <hgroup> within a <section>, the <h1> will be styled relative to the section while the <h2> is styled relative to the page. This results in the <h1> actually being smaller than the <h2>, even though they are actually part of the same header and should maintain their relative size difference. A minimal testcase is included in the URL field. I have also filed a Mozilla bug on the matter: https://bugzilla.mozilla.org/show_bug.cgi?id=774098
Created attachment 1159 [details] Extended testcase This is a more expanded testcase that demonstrates exhaustive embedding of all <hN> sizes.
This bug was cloned to create bug 17894 as part of operation convergence.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy-v2.html Status: Accepted Change Description: https://github.com/w3c/html/commit/f9ca5253c3efc272e6527a8e26fad6d7d9a0fff0 Rationale: accepted WHATWG change for HTML5.1; re-open if you'd like to see it applied to HTML5 CR. More details at https://www.w3.org/Bugs/Public/show_bug.cgi?id=17894