- From: Steve Faulkner <faulkner.steve@gmail.com>
- Date: Sat, 19 Aug 2017 09:14:46 +0100
- To: Bryan Garaventa <bryan.garaventa@levelaccess.com>
- Cc: Matt King <a11ythinker@gmail.com>, Rich Schwerdtfeger <richschwer@gmail.com>, ARIA Working Group <public-aria@w3.org>
- Message-ID: <CA+ri+VmCbW+4D_HHXFBLJ8oUwbSyU4mW3Nw3aE0H3=k306B2MA@mail.gmail.com>
Hi all, have updated the spec text to clarify that HTML elements with implied roles can have ARIA attributes which are allowed for use on the (implied) ARIA role. https://github.com/w3c/html-aria/commit/c3531bce503b3f598a33f04dfefb1c1d18487bd4 -- Regards SteveF Current Standards Work @W3C <http://www.paciellogroup.com/blog/2015/03/current-standards-work-at-w3c/> On 16 August 2017 at 21:15, Steve Faulkner <faulkner.steve@gmail.com> wrote: > Hi all, am at somewhat of a disadvantage as currently on vacation, so > doing everything via phone. > > If a HTML element has an implied role mapping it does not need to have an > explicit role that matches the implicit role. In fact to do so is a HTML > conformance error. In general any aria properties that can be used with an > aria role can also be used with a native element that has an implicit aria > role without explicitly declaring the role. > > There is an ambiguity with the conformance text around this in the ARIA in > HTML specification which I will correct when I return. > > > On Wednesday, 16 August 2017, Bryan Garaventa < > bryan.garaventa@levelaccess.com> wrote: > >> I'm not sure where this is to go specifically, but it involves ARIA since >> there are already native role mappings supported by the browsers, and this >> is already changing the accessibility tree. >> >> So by your logic the following should not work either: >> >> <button aria-pressed="true">Test</button> >> >> So, if adding a role on a native element is disallowed, such as >> role="button", how do you turn this into a toggle button? >> >> By the way this is already happening in the various browsers, so if you >> disallow this then all of these implementations will have to be undone. E.G >> I just verified that this maps to a PushButton with a "PRESSED" state in >> the latest versions of Firefox, Chrome Canary, and Safari on Ios. >> >> So this functionality is either allowed globally, or disallowed globally. >> >> I don't personally see why there is any conflict with allowing this >> because it fits with the implicit role mapping paradigm. If these elements >> are not meant to act like the roles they represent, why are there any >> implicit ARIA role mappings at all? >> >> >> Bryan Garaventa >> Accessibility Fellow >> Level Access, Inc. >> Bryan.Garaventa@LevelAccess.com >> 415.624.2709 (o) >> www.LevelAccess.com >> >> -----Original Message----- >> From: Matt King [mailto:a11ythinker@gmail.com] >> Sent: Wednesday, August 16, 2017 10:36 AM >> To: Bryan Garaventa <bryan.garaventa@levelaccess.com>; 'Rich >> Schwerdtfeger' <richschwer@gmail.com> >> Cc: 'ARIA Working Group' <public-aria@w3.org> >> Subject: RE: ARIA and HTML document question about implicit headings >> >> Seems to me like this is not an ARIA issue, but an HTML issue. >> >> Per ARIA section 7.5 Conflicts with Host Language Semantics[1] >> >> > When WAI-ARIA states and properties correspond to host language >> > features that have the same implicit WAI-ARIA semantic, it can be >> > particularly problematic to use the WAI-ARIA feature. >> > If the WAI-ARIA feature and the host language feature are both >> > provided >> but their values are not kept in sync, >> > user agents and assistive technologies cannot know which value to use. >> > Therefore, to prevent providing conflicting states and properties to >> assistive technologies, >> > host languages must explicitly declare where the use of WAI-ARIA >> > attributes on each host language element conflicts >> with native attributes for that element. >> >> HTML heading levels have an implied ARIA semantic that can conflict with >> the aria-level property. >> Therefore, per the above, HTML MUST explicitly declare where the use of >> aria-level on heading elements conflicts with native heading level values. >> >> Personally, I think allowing authors to override the level of a heading, >> e.g., <h1 aria-level="3">, creates inconsistency in the processing of ARIA. >> If the author wants the level reported to AT to be 3, then use an H3 or >> use a div with role heading and aria-level 3. >> >> But, regardless of what ends up being allowed, I don't see how this is an >> issue for ARIA. It appears to be something that should be resolved in HTML. >> >> Matt >> >> [1] http://w3c.github.io/aria/aria/aria.html#host_general_conflict >> >> -----Original Message----- >> From: Bryan Garaventa [mailto:bryan.garaventa@levelaccess.com] >> Sent: Tuesday, August 15, 2017 4:20 PM >> To: Rich Schwerdtfeger <richschwer@gmail.com> >> Cc: ARIA Working Group <public-aria@w3.org> >> Subject: RE: ARIA and HTML document question about implicit headings >> >> I'll be happy to submit something for 1.2. Before I do though, this is >> the logic that makes sense to me. >> >> Since there are implicit ARIA roles applied to certain native markup, >> making it possible to represent the same role in the accessibility tree >> regardless if a native element is used or its equivalent role on a >> differing element type, it makes sense that applying supported ARIA >> attributes to either of these constructs would result in a subsequent >> update to the accessibility tree accordingly. >> >> E.G >> >> <img aria-label="Test" > Would result in an image with an accessible name >> of "Test". >> >> <h2 aria-level="3"> Test </h2> would result in a heading role with a >> level of 3. >> >> <button aria-pressed="true"> Test </button> would result in a pressed >> toggle button. >> >> And so on with supporting atributes for these role types. >> >> I'm not talking about substituting ARIA attributes for native host >> semantics like the use of aria-checked instead of checked on a native >> checkbox or radio button (input+type=checkbox|radio), but rather the >> updating of native accessibility tree roles with supporting ARIA attributes >> when there is no equivalent native host semantic available. >> >> This would be helpful in many cases, and already occurs for many roles in >> browsers already. >> >> Bryan Garaventa >> Accessibility Fellow >> Level Access, Inc. >> Bryan.Garaventa@LevelAccess.com >> 415.624.2709 (o) >> www.LevelAccess.com >> >> -----Original Message----- >> From: Rich Schwerdtfeger [mailto:richschwer@gmail.com] >> Sent: Monday, August 14, 2017 6:46 PM >> To: Bryan Garaventa <bryan.garaventa@levelaccess.com> >> Cc: ARIA Working Group <public-aria@w3.org> >> Subject: Re: ARIA and HTML document question about implicit headings >> >> This was identified as an issue for ARIA 1.1 in part because we started >> to move toward role parity with HTML 5. The others issues you now raise >> were not. >> >> If you would like to other things addressed you should put them in ARIA >> 1.2 issues on github. >> >> Rich >> >> Sent from my iPhone >> >> > On Aug 14, 2017, at 12:49 PM, Bryan Garaventa >> <bryan.garaventa@levelaccess.com> wrote: >> > >> > Hi, >> > I noticed recently that according to the ARIA and HTML mapping tables, >> > the >> use of aria-level is said to not be allowed on H1 through H6 elements, >> even though these implicitly map to role="heading". >> > >> > Since supporting attributes like aria-pressed and aria-haspopup are >> accepted on other implicit elements like role="button", amongst other >> implicit role and attribute combinations, why is this one different? >> > >> > Bryan Garaventa >> > Accessibility Fellow >> > Level Access, Inc. >> > Bryan.Garaventa@LevelAccess.com >> > 415.624.2709 (o) >> > www.LevelAccess.com >> > >> > >> >> >> >> > > -- > -- > > Regards > > SteveF > Current Standards Work @W3C > <http://www.paciellogroup.com/blog/2015/03/current-standards-work-at-w3c/> > >
Received on Saturday, 19 August 2017 08:15:50 UTC