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details Element Should Not Be a Sectioning Root for Outline Algorithm #2447

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patrickdark opened this issue Mar 19, 2017 · 2 comments
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details Element Should Not Be a Sectioning Root for Outline Algorithm #2447

patrickdark opened this issue Mar 19, 2017 · 2 comments
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needs compat analysis normative change

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@patrickdark
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patrickdark commented Mar 19, 2017 •
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Consider this HTML:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>Test</title>
	</head>
	<body>
		<h1>Page Title</h1>
		<nav>
			<details>
				<summary>
					<h1>Navigation Heading</h1>
				</summary>
				<main>
					<p>This is filler content.</p>
				</main>
			</details>
		</nav>
		<section>
			<details>
				<summary>
					<h1>Heading 1</h1>
				</summary>
				<main>
					<p>This is filler content.</p>
				</main>
			</details>
		</section>
		<section>
			<details>
				<summary>
					<h1>Heading 2</h1>
				</summary>
				<main>
					<p>This is filler content.</p>
				</main>
			</details>
		</section>
		<section>
			<details>
				<summary>
					<h1>Heading 3</h1>
				</summary>
				<main>
					<p>This is filler content.</p>
				</main>
			</details>
		</section>
	</body>
</html>

(I'm using XSLT to remodel all nav and section elements into like structures.)

Intuitively, this document has a page title with four page headings.

Per my reading of the spec at https://html.spec.whatwg.org/multipage/semantics.html#sectioning-root, however, this document has a page title and four untitled sections. This seems to be confirmed by the Nu Html Checker at https://validator.w3.org/nu/?showoutline=yes#textarea.

The four details elements instead create four localized outlines. I can't figure out how that's more useful than making them transparent for the sake of the outline algorithm.

It seems that the details element should be undesignated as a sectioning root. At a minimum, there should be a note at https://html.spec.whatwg.org/multipage/forms.html#the-details-element describing this element as a sectioning root with a warning about this coding pattern not behaving as expected.
@patrickdark patrickdark changed the title details Element Should Not Be a Sectioning Root details Element Should Not Be a Sectioning Root for Outline Algorithm Mar 19, 2017
@patrickdark patrickdark mentioned this issue Mar 21, 2017
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@zcorpan zcorpan added addition/proposal New features or enhancements normative change and removed addition/proposal New features or enhancements labels Sep 1, 2018
@zcorpan
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zcorpan commented Sep 1, 2018

This was introduced in 7983b29

https://lists.w3.org/Archives/Public/public-whatwg-archive/2009Oct/0422.html

It would be helpful to analyze usage in httparchive to inform what to do here.

@zcorpan
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zcorpan commented May 29, 2023

Sectioning root was removed in #7829

@zcorpan zcorpan closed this as completed May 29, 2023
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