prevent use of aria-hidden=true on document root elements #1880

scottaohara · 2023-03-03T13:38:06Z

adds user agent and author requirements regarding the use of aria-hidden=true on root-level elements of a document.

@cookiecrook I took a first stab at drafting up the author and UA must nots. Please revise however you see fit.

Related Core AAM Issue/PR:
Related AccName Issue/PR:
Related APG Issue/PR:
ARIA in HTML 447

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@cookiecrook

closes #1254 @cookiecrook I took a first stab at drafting up the author and UA must nots. Please revise however you see fit.

cookiecrook

Great start. Raising some questions that I don't currently know the answer to. Thanks for taking this one on!

index.html

jcsteh

Thanks for working on this.

Does this conflict with #1256? That proposal has its own set of challenges, but as I understand it, it could be used to emulate dialog.showModal(). That is, an author might set aria-hidden=true on the root and then set aria-hidden=false on a (non-native) modal dialog.

I tend to think the risk of abuse with aria-hidden on the root is higher than the advantages of supporting the theoretical emulation of dialog.showModal(), but I know there's been some push to have parallel support in ARIA for native HTML features, which is why I'm raising it here.

Co-authored-by: James Craig <cookiecrook@users.noreply.github.com>

scottaohara · 2023-03-24T17:54:22Z

thanks a ton for those edits, @cookiecrook

index.html

companion PR to w3c/aria#1880

https://bugs.webkit.org/show_bug.cgi?id=269523 rdar://123049663 Reviewed by Chris Fleizach. To prevent authors from hiding all content from assistive technologies, aria-hidden should not be respected on document root elements (`html`, `body`, or top-level `svg`s). w3c/aria#1880 * LayoutTests/accessibility/body-element-aria-hidden-expected.txt: Added. * LayoutTests/accessibility/body-element-aria-hidden.html: Added. * LayoutTests/accessibility/html-element-aria-hidden-expected.txt: Added. * LayoutTests/accessibility/html-element-aria-hidden.html: Added. * LayoutTests/platform/ios/TestExpectations: Enable new tests. * Source/WebCore/accessibility/AXCoreObject.h: * Source/WebCore/accessibility/AccessibilityObject.cpp: (WebCore::AccessibilityObject::isARIAHidden const): (WebCore::AccessibilityObject::tagName const): (WebCore::AccessibilityObject::setIsIgnoredFromParentDataForChild): * Source/WebCore/accessibility/AccessibilityObject.h: * Source/WebCore/accessibility/atspi/AccessibilityObjectAtspi.cpp: (WebCore::AccessibilityObjectAtspi::attributes const): * Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp: (WebCore::AXIsolatedObject::tagName const): Deleted. * Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.h:

https://bugs.webkit.org/show_bug.cgi?id=269523 rdar://123049663 Reviewed by Chris Fleizach. To prevent authors from hiding all content from assistive technologies, aria-hidden should not be respected on document root elements (`html`, `body`, or top-level `svg`s). w3c/aria#1880 * LayoutTests/accessibility/body-element-aria-hidden-expected.txt: Added. * LayoutTests/accessibility/body-element-aria-hidden.html: Added. * LayoutTests/accessibility/html-element-aria-hidden-expected.txt: Added. * LayoutTests/accessibility/html-element-aria-hidden.html: Added. * LayoutTests/platform/ios/TestExpectations: Enable new tests. * Source/WebCore/accessibility/AXCoreObject.h: * Source/WebCore/accessibility/AccessibilityObject.cpp: (WebCore::AccessibilityObject::isARIAHidden const): (WebCore::AccessibilityObject::tagName const): (WebCore::AccessibilityObject::setIsIgnoredFromParentDataForChild): * Source/WebCore/accessibility/AccessibilityObject.h: * Source/WebCore/accessibility/atspi/AccessibilityObjectAtspi.cpp: (WebCore::AccessibilityObjectAtspi::attributes const): * Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp: (WebCore::AXIsolatedObject::tagName const): Deleted. * Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.h: Canonical link: https://commits.webkit.org/277677@main

aleventhal

Hopefully it is clear to readers what a primary document is. Do we need to define that in the glossary or is it really obvious to the intended audience?

cookiecrook

@scottaohara, in an earlier comment you said the embedded view (iframe, img, etc) could be hidden by the containing context, so on a per-document level, this rule need not be aware of its embeddedness, or whether it's the "primary" document.

the root element or the host language element that represents the contents of the ~~primary~~ document in view.

I agree with you, so it's possible this ~"root element or the host language element representing contents" is sufficient without the undefined "primary document" term.

aleventhal · 2024-04-26T14:31:01Z

What if the parent document doesn't have as much context as the iframe's contents about whether it should be hidden or not? They might not even be from the same domain. Is it difficult for any of the implementations to determine whether the document is top level?

aleventhal

Removing my +1 until we get consensus on whether the top level document's documentElement/body is treated differently from the iframe's.

cookiecrook · 2024-04-26T17:14:45Z

Removing my +1 until we get consensus on whether the top level document's documentElement/body is treated differently from the iframe's.

If that's a deal-breaker for Aaron, I'd say let's keep "primary." It does allow more permissive authoring flexibility, albeit adding a bit more implementation complexity.

aleventhal · 2024-04-26T19:34:17Z

I think it just adds a single condition to the 'if' statement. Not too complex IMO. I'd rather not deal with the bug that gets filed with a legit use case. But perhaps Scott has a good reason to disallow in iframe html/body elements.

scottaohara · 2024-04-27T17:00:18Z

Allowing an html/body element to have aria-hidden=true on it in an iframe wouldn’t do anything to prevent the exposure of the iframe in the parent doc

However is the iframe in the parent doc could be consistently set to be hidden / taken out of the tab order, then that could prevent the nested iframe content from being accessible

I fail to understand why there should be any distinction whether aria-hidden is set to the html/body elements within an iframe or not, since it’d be unnecessary if the iframe in the parent doc was properly hidden, and if the iframe was not properly hidden, then respecting the aria-hidden attribute in that context would result in the problem we are trying to solve with this change

spectranaut · 2024-05-02T20:53:31Z

Adding agenda to "get consensus" re: Aaron's concerns so we can move this one forward!

spectranaut · 2024-05-09T18:17:21Z

discussed in https://www.w3.org/2024/05/09-aria-minutes.html#t10

Decision to move forward

aleventhal · 2024-05-10T14:19:36Z

Ok, let's go with disallowing aria-hidden on <body> and any document element <html>, <svg>.

index.html

aleventhal

Excellent. I can't find anything that would be confusing, vague or isn't a clear improvement.

companion PR to #1880

aleventhal · 2024-07-09T20:42:26Z

In terms of "waiting for implementations". Chrome has implemented this.

pkra · 2024-07-10T08:20:29Z

@scottaohara the WebKit issue also seems to have been resolved, so this might be ready to merge.

scottaohara · 2024-07-11T16:24:56Z

related HTML AAM PR has been merged.

prevent use of aria-hidden=true on document root elements

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closes #1254 @cookiecrook I took a first stab at drafting up the author and UA must nots. Please revise however you see fit.

cookiecrook reviewed Mar 3, 2023

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scottaohara and others added 2 commits March 24, 2023 13:52

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Co-authored-by: James Craig <cookiecrook@users.noreply.github.com>

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Co-authored-by: James Craig <cookiecrook@users.noreply.github.com>

Merge branch 'main' into aria-hidden-issue-1254

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cookiecrook approved these changes Apr 18, 2023

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pkra added this to the ARIA 1.3 milestone Jun 28, 2023

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scottaohara added a commit to w3c/html-aam that referenced this pull request Nov 15, 2023

UA ignore aria-hidden on root elements

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companion PR to w3c/aria#1880

scottaohara mentioned this pull request Nov 15, 2023

UA ignore aria-hidden on root elements w3c/html-aam#516

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scottaohara mentioned this pull request Feb 16, 2024

ARIA in HTML update for body element validator/validator#1559

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spectranaut added the waiting for implementations add to traking issue when PR is merged into main, but can't be merged into stable label Feb 22, 2024

JonWBedard mentioned this pull request Apr 15, 2024

AX: aria-hidden=true should be ignored on the body and html elements WebKit/WebKit#27294

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aleventhal approved these changes Apr 25, 2024

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Merge branch 'main' into aria-hidden-issue-1254

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scottaohara mentioned this pull request May 20, 2024

Rethink how "hidden" is aria-hidden content? #1951

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UA ignore aria-hidden on root elements

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companion PR to #1880

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prevent use of aria-hidden=true on document root elements #1880

prevent use of aria-hidden=true on document root elements #1880

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prevent use of aria-hidden=true on document root elements #1880

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