LGTM1 to ship `dynamic-range` without the video prefixed variant.

On Thu, Dec 9, 2021 at 4:42 AM Will Cassella <cas...@chromium.org> wrote:

> Sorry for the delay! I'm currently working on that, it'll most likely be
> up some time tomorrow. That only covers the video-* media features, given
> that Safari has already shipped the regular (non-prefixed) dynamic-range media
> feature, should we go ahead with shipping that and follow up with
> video-dynamic-range after TAG review in a separate I2S?
>
> On Wed, Dec 8, 2021 at 8:34 AM Mike West <mk...@chromium.org> wrote:
>
>> Friendly ping on Yoav's suggestion. Did y'all file a TAG review request?
>>
>> -mike
>>
>>
>> On Wed, Dec 1, 2021 at 11:47 AM Yoav Weiss <yoavwe...@chromium.org>
>> wrote:
>>
>>> Since we're talking about adding a full new class of MQs, that seems
>>> worthy of a TAG discussion.
>>>
>>> On Tuesday, November 30, 2021 at 1:38:13 AM UTC+1 Will Cassella wrote:
>>>
>>>> Sorry for missing that! There's a section in the spec for 'video-*'
>>>> MQ's <https://drafts.csswg.org/mediaqueries-5/#video-prefixed-features>,
>>>> and while this is the first to be implemented in Chrome there are others
>>>> detailed there (most notably video-color-gamut). The 'video-*' MQ
>>>> concept has not been discussed with TAG, but it was discussed at great
>>>> length between the media and CSS WGs. You can see the start of that
>>>> discussion in the media WG here
>>>> <https://github.com/w3c/media-capabilities/issues/135>, and its jump
>>>> to the CSS WG here <https://github.com/w3c/csswg-drafts/issues/4471>.
>>>> In both places we had representation from different user agents and domain
>>>> experts.
>>>>
>>>> On Thu, Nov 25, 2021 at 12:51 AM Yoav Weiss <yoavwe...@chromium.org>
>>>> wrote:
>>>>
>>>>> Thanks for the update!
>>>>>
>>>>> Repeating my question from above, that probably got lost along the
>>>>> way: Was the concept of `video-*` MQs discussed with the TAG? Are there
>>>>> other `video-*` MQs that are already shipped?
>>>>>
>>>>> On Wed, Nov 24, 2021 at 9:33 PM Will Cassella <cas...@chromium.org>
>>>>> wrote:
>>>>>
>>>>>> There's been movement on the Github issue
>>>>>> <https://github.com/w3c/csswg-drafts/issues/6793#issuecomment-973647057> 
>>>>>> regarding
>>>>>> the spec, and the consensus is that the way Safari has done things 
>>>>>> (having dynamic-range:
>>>>>> standard always return true, and dynamic-range: high be evaluated
>>>>>> against the capabilities of the display) is what we should be doing, and
>>>>>> the wording of the spec should be adjusted as well. I've updated our
>>>>>> implementation to reflect that.
>>>>>>
>>>>>> On Thu, Nov 18, 2021 at 12:04 PM Chris Harrelson <
>>>>>> chris...@chromium.org> wrote:
>>>>>>
>>>>>>> Ok thanks. It looks like the CSSWG discussed the issue and there
>>>>>>> still needs to be more discussion before a resolution is achieved, so 
>>>>>>> we'll
>>>>>>> wait for that.
>>>>>>>
>>>>>>> On Fri, Nov 5, 2021 at 3:45 PM Will Cassella <cas...@chromium.org>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hey Chris,
>>>>>>>>
>>>>>>>> I’ve filed an issue on the csswg-drafts repo
>>>>>>>> <https://github.com/w3c/csswg-drafts/issues/6793> asking for the
>>>>>>>> wording to be adjusted in the spec. In the original discussion 
>>>>>>>> surrounding
>>>>>>>> this media query, the intent was for this to be reflective of the 
>>>>>>>> display
>>>>>>>> device and not an overall representation of the user agent's 
>>>>>>>> capabilities.
>>>>>>>> I did some research into Safari's implementation
>>>>>>>> <https://github.com/WebKit/WebKit/blob/e1adc392ff841dee89aab69af21e3c429e4d5c88/Source/WebCore/css/MediaQueryEvaluator.cpp#L453>
>>>>>>>> of this query, and while they similarly implement dynamic-range:
>>>>>>>> high with respect to the display device, their treatment of 
>>>>>>>> dynamic-range:
>>>>>>>> standard isn't in line with the spec (it always returns true, even
>>>>>>>> on HDR displays). After some discussion with +chcunningham, we think 
>>>>>>>> this
>>>>>>>> may be the correct path forward for Chrome as well as sites are already
>>>>>>>> using this query on Safari, and it makes sense from a backwards
>>>>>>>> compatibility standpoint (how should dynamic-range: high react if
>>>>>>>> an ultra-high enum is ever added?). I'm still waiting to get
>>>>>>>> feedback on the Github issue I filed at the moment.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Will
>>>>>>>>
>>>>>>>> On Thu, Nov 4, 2021 at 12:30 PM Chris Harrelson <
>>>>>>>> chris...@chromium.org> wrote:
>>>>>>>>
>>>>>>>>> Hi, there were some discussions of the spec, and other questions,
>>>>>>>>> so far in the thread. Will, could you summarize the current status? 
>>>>>>>>> Thanks.
>>>>>>>>>
>>>>>>>>> On Thu, Oct 28, 2021 at 12:04 PM David Baron <dba...@chromium.org>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Thu, Oct 28, 2021 at 2:38 PM Yoav Weiss <
>>>>>>>>>> yoavwe...@chromium.org> wrote:
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Friday, October 22, 2021 at 10:19:44 PM UTC+2 Fernando
>>>>>>>>>>> Serboncini wrote:
>>>>>>>>>>>
>>>>>>>>>>>> [coming from the other thread... :) ]
>>>>>>>>>>>>
>>>>>>>>>>>> +1 to what David said. It doesn't seem that returning 
>>>>>>>>>>>> dynamic-range:
>>>>>>>>>>>> high right now would be useful.
>>>>>>>>>>>>
>>>>>>>>>>>> The spec could use some clarification:
>>>>>>>>>>>> - clarify if those criterias need to be supported on different
>>>>>>>>>>>> conditions: CSS, images, canvas, ...
>>>>>>>>>>>> - clarify if the criterias need to be supported for both
>>>>>>>>>>>> with/without alpha (afaik there may be implementation differences 
>>>>>>>>>>>> there,
>>>>>>>>>>>> but I may be wrong here).
>>>>>>>>>>>> - I wonder if the definitions of high contrast/peak brightness
>>>>>>>>>>>> should match the industry definitions for HDR displays? I'm not an 
>>>>>>>>>>>> expert,
>>>>>>>>>>>> but I know those exist.
>>>>>>>>>>>> I think it's potentially okay to ignore those definitions, but
>>>>>>>>>>>> I'd ask for a rationale here.
>>>>>>>>>>>>
>>>>>>>>>>>> I think it's a great thing to summarize hdr into a single media
>>>>>>>>>>>> query, but the risk here would be to release a semantic that 
>>>>>>>>>>>> guarantees
>>>>>>>>>>>> very little, and therefore is not useful in the long run.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Fri, Oct 22, 2021 at 10:04 AM David Baron <
>>>>>>>>>>>> dba...@chromium.org> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> This sounds like exactly the sort of case where an
>>>>>>>>>>>>> implementation should report (dynamic-range: standard) and 
>>>>>>>>>>>>> (video-dynamic-range:
>>>>>>>>>>>>> high).  It would be great to see the spec clarified to make
>>>>>>>>>>>>> it clearer what UA support is expected for each, though.
>>>>>>>>>>>>>
>>>>>>>>>>>>> -David
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Thu, Oct 21, 2021 at 7:03 PM Will Cassella <
>>>>>>>>>>>>> cas...@chromium.org> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Copying over from the other thread (trying to continue the
>>>>>>>>>>>>>> discussion here):
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> The spec
>>>>>>>>>>>>>>> <https://www.w3.org/TR/mediaqueries-5/#dynamic-range> requires
>>>>>>>>>>>>>>> that "The combination of the User Agent and the output device 
>>>>>>>>>>>>>>> fulfill all
>>>>>>>>>>>>>>> of the following criteria" when describing what it means to be 
>>>>>>>>>>>>>>> high
>>>>>>>>>>>>>>> dynamic-range.  Since Chromium doesn't support wide-gamut 
>>>>>>>>>>>>>>> colors in CSS,
>>>>>>>>>>>>>>> HTML, or Canvas
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>> David - I'm likely missing something here, but I thought (based
>>>>>>>>>>> on this thread
>>>>>>>>>>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/epSTNPYkLIs/m/o5l7pZk1AwAJ>)
>>>>>>>>>>> that we do have wide-gamut support in CSS, HTML and Canvas.
>>>>>>>>>>> Are you saying we don't support this due to lack of color level
>>>>>>>>>>> 4 support? Or something else?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> That intent makes it sound like we have wide-gamut support for
>>>>>>>>>> canvas (though others would be able to speak more authoritatively 
>>>>>>>>>> about it)
>>>>>>>>>> but I don't think we do in HTML or CSS.  (I also should have included
>>>>>>>>>> images in my list, though I think if we have support with canvas 
>>>>>>>>>> then we
>>>>>>>>>> probably do for images as well.).)
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>> I also didn't interpret the spec as saying anything about gamut
>>>>>>>>>>> (but rather about color depth
>>>>>>>>>>> <https://www.w3.org/TR/mediaqueries-5/#color>), although it may
>>>>>>>>>>> be possible that wide gamuts and high color depth correlate 1:1. 
>>>>>>>>>>> Can you
>>>>>>>>>>> clarify if that's what you meant?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I should have been more precise about meeting the spec's
>>>>>>>>>> requirements rather than just using the term "wide-gamut".  You're 
>>>>>>>>>> correct
>>>>>>>>>> that it's not 1:1, though I think that in practice an implementation 
>>>>>>>>>> is
>>>>>>>>>> unlikely to meet the spec's requirements on color depth and contrast 
>>>>>>>>>> ratio
>>>>>>>>>> without supporting colors beyond sRGB's gamut.
>>>>>>>>>>
>>>>>>>>>> (I also suspect we may not meet the color depth requirement in
>>>>>>>>>> the spec, perhaps not for canvas or images as well.)
>>>>>>>>>>
>>>>>>>>>> -David
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> , I think it's probably incorrect to report that (dynamic-range:
>>>>>>>>>>>>>>> high) is true based only on the device, which is what it
>>>>>>>>>>>>>>> looks to me like the current code
>>>>>>>>>>>>>>> <https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/css/media_query_evaluator.cc;l=351-378;drc=4d3cb20c1aebba55e54112531222c7434d29f3b0>
>>>>>>>>>>>>>>>  does.
>>>>>>>>>>>>>>> Admittedly, the spec could probably use some clarification as 
>>>>>>>>>>>>>>> to what it
>>>>>>>>>>>>>>> means for the User Agent to fulfill the criteria for both the
>>>>>>>>>>>>>>> dynamic-range and video-dynamic-range queries, but my
>>>>>>>>>>>>>>> understanding of what the spec is trying to say is that Chrome 
>>>>>>>>>>>>>>> probably
>>>>>>>>>>>>>>> shouldn't say that (dynamic-range: high) is true until it
>>>>>>>>>>>>>>> supports wide-gamut colors in at least some and maybe all of 
>>>>>>>>>>>>>>> those contexts.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I think you're right that the spec needs some clarification,
>>>>>>>>>>>>>> since we're trying to incrementally enable adoption of HDR on 
>>>>>>>>>>>>>> the web the
>>>>>>>>>>>>>> intent isn't to signal that HDR is supported by all APIs. We
>>>>>>>>>>>>>> do already support HDR in some scenarios, such as the <video> 
>>>>>>>>>>>>>> element, so
>>>>>>>>>>>>>> having these queries exist to let developers detect display 
>>>>>>>>>>>>>> capabilities is
>>>>>>>>>>>>>> already useful.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Wed, Oct 20, 2021 at 11:27 PM Yoav Weiss <
>>>>>>>>>>>>>> yoavwe...@chromium.org> wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Thu, Oct 21, 2021 at 7:01 AM Will Cassella <
>>>>>>>>>>>>>>> cas...@chromium.org> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Thanks for the feedback! I've updated that section:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Debuggability
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Styles with these media queries can be viewed and edited in
>>>>>>>>>>>>>>>> the devtools frontend, albeit without proper highlighting. 
>>>>>>>>>>>>>>>> I've created
>>>>>>>>>>>>>>>> pull requests on the relevant libraries used in the devtools 
>>>>>>>>>>>>>>>> frontend to
>>>>>>>>>>>>>>>> enable this.
>>>>>>>>>>>>>>>> https://github.com/stylelint/stylelint/pull/5613
>>>>>>>>>>>>>>>> https://github.com/codemirror/CodeMirror/pull/6803
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Wednesday, October 20, 2021 at 9:10:36 AM UTC-7 Mathias
>>>>>>>>>>>>>>>> Bynens wrote:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> On Wed, Oct 20, 2021 at 5:44 PM Will Cassella <
>>>>>>>>>>>>>>>>> cas...@chromium.org> wrote:
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Contact emailscas...@chromium.org,
>>>>>>>>>>>>>>>>>> chcunning...@chromium.org, videostack-...@chromium.org
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Explainer
>>>>>>>>>>>>>>>>>> Adds MediaQueries for detecting HDR vs HDR displays
>>>>>>>>>>>>>>>>>> https://www.w3.org/TR/mediaqueries-5/#dynamic-range
>>>>>>>>>>>>>>>>>> https://www.w3.org/TR/mediaqueries-5/#video-dynamic-range
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Specification
>>>>>>>>>>>>>>>>>> https://www.w3.org/TR/mediaqueries-5/#dynamic-range
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Summary
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Adds media queries to CSS which allow a page to detect
>>>>>>>>>>>>>>>>>> the current display device’s support for HDR. This feature 
>>>>>>>>>>>>>>>>>> adds two new CSS
>>>>>>>>>>>>>>>>>> media queries: 'dynamic-range' and 'video-dynamic-range', 
>>>>>>>>>>>>>>>>>> both of which may
>>>>>>>>>>>>>>>>>> be one of 'standard' or 'high'. Chrome will resolve these 
>>>>>>>>>>>>>>>>>> queries according
>>>>>>>>>>>>>>>>>> to the capabilities of the display device the browser window 
>>>>>>>>>>>>>>>>>> is currently
>>>>>>>>>>>>>>>>>> positioned on, allowing pages to toggle CSS rules 
>>>>>>>>>>>>>>>>>> accordingly or respond in
>>>>>>>>>>>>>>>>>> Javascript via 'window.matchMedia()'.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Blink componentBlink>CSS
>>>>>>>>>>>>>>>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Motivation
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> As HDR-supported displays become more common, web
>>>>>>>>>>>>>>>>>> developers need ways to enable HDR content on their web 
>>>>>>>>>>>>>>>>>> pages without
>>>>>>>>>>>>>>>>>> compromising the experience for users of non-HDR displays, 
>>>>>>>>>>>>>>>>>> or mixed-HDR
>>>>>>>>>>>>>>>>>> multi-display setups. CSS already provides the 'media query' 
>>>>>>>>>>>>>>>>>> concept for
>>>>>>>>>>>>>>>>>> toggling rules based on display device characteristics, and 
>>>>>>>>>>>>>>>>>> this feature
>>>>>>>>>>>>>>>>>> extends that set of queries to enable detecting HDR support 
>>>>>>>>>>>>>>>>>> on the current
>>>>>>>>>>>>>>>>>> display device.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Initial public proposal
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> TAG reviewNot Filed. This is an incremental change to
>>>>>>>>>>>>>>>>>> CSS Media Queries, already adopted by CSS WG.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I agree a TAG review is not needed for the `dynamic-range`
>>>>>>>>>>>>>>> MQ, as it's shipped in Safari and adopted by the CSSWG.
>>>>>>>>>>>>>>> The video variant however doesn't meet that criteria. Was
>>>>>>>>>>>>>>> the concept of `video-*` MQs discussed with the TAG? Are there 
>>>>>>>>>>>>>>> other
>>>>>>>>>>>>>>> `video-*` MQs that are already shipped?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> TAG review statusNot applicable
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Risks
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Interoperability and Compatibility
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Gecko: Worth prototyping (
>>>>>>>>>>>>>>>>>> https://github.com/mozilla/standards-positions/issues/584
>>>>>>>>>>>>>>>>>> )
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> WebKit: Shipped/Shipping (
>>>>>>>>>>>>>>>>>> https://webkit.org/blog/10247/new-webkit-features-in-safari-13-1/)
>>>>>>>>>>>>>>>>>> Partially implemented - `video-dynamic-range` not yet 
>>>>>>>>>>>>>>>>>> supported
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Web developers: Positive (
>>>>>>>>>>>>>>>>>> https://github.com/w3c/csswg-drafts/issues/4471#issuecomment-548085935)
>>>>>>>>>>>>>>>>>> Feature designed with the help of Netflix.
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Debuggability
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> No specific DevTools support
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Please follow https://goo.gle/devtools-checklist and
>>>>>>>>>>>>>>>>> elaborate on this a little bit. Per the guide, we need to 
>>>>>>>>>>>>>>>>> ensure DevTools
>>>>>>>>>>>>>>>>> supports basic editing of this new media query. It looks like 
>>>>>>>>>>>>>>>>> this works
>>>>>>>>>>>>>>>>> out of the box in Canary.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Is this feature fully tested by web-platform-tests
>>>>>>>>>>>>>>>>>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
>>>>>>>>>>>>>>>>>> ?Yes
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> https://wpt.fyi/results/css/mediaqueries/dynamic-range.html
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Flag nameCSSDynamicRangeMediaQueries
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Requires code in //chrome?False
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Tracking bughttps://crbug.com/1224711
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Estimated milestones97
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Link to entry on the Chrome Platform Status
>>>>>>>>>>>>>>>>>> https://chromestatus.com/feature/5680926106320896
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> This intent message was generated by Chrome Platform
>>>>>>>>>>>>>>>>>> Status <https://www.chromestatus.com/>.
>>>>>>>>>>>>>>>>>>
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