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Attributes `imagesrcset` and `imagesizes` attributes on <link> #4048

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domfarolino commented Sep 26, 2018

HTML Standard-size changes for w3c/preload#120

TODO:

  • Consider an obtain the preload resource override for obtain the resource under the Link type "preload" section, that:
    • Checks to see if as == image, and if so
    • Do some stuff similar to step 9 and below in update the image data (like calling the image selection algorithm etc)
    • Otherwise defer to general obtain the resource algorithm
  • List imagesrcset and imagesizes mutations under appropriate times (PR is up)

Would appreciate some thoughts thus far; is this even the direction we want to go, i.e., making some of the algorithms in the images section fit the link element? /cc @zcorpan


/images.html ( diff )
/index.html ( diff )
/indices.html ( diff )
/links.html ( diff )
/semantics.html ( diff )

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zcorpan commented Sep 26, 2018

How do we handle the picture case?

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domfarolino commented Sep 26, 2018

By picture case do you mean a link nested within a picture? If so, it seems <link> is not allowed to be nested in a <picture>, so I assume we just don't search for it as a parent, or its <source> children, in update the source set. If not, could you elaborate?

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eeeps commented Sep 26, 2018

Other way around; imgsrcset and imgsizes would allow authors to preload resources that will be encountered by browsers in <img srcset>, later; it would be nice to allow authors to preload resources that will be encountered in <picture>/<source>, too.

E.g., how can authors preload a resource for:

<picture>
<source media=“(min-width: 800px)” srcset=“big.jpg 1200w, small.jpg 600w”>
<img srcset=“cropped-big.jpg 800w, cropped-small.jpg 400w”>
</picture>
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tabatkins commented Sep 26, 2018

Presumably we can just use the pre-existing <link media>?

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eeeps commented Sep 26, 2018

Oh, of course.

And link type can cover source type cases too, I bet 🎉

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zcorpan commented Sep 26, 2018

So if you have

<link rel=preload as=image media="(min-width: 800px)" imagesrcset="big.jpg 1200w, small.jpg 600w">
<link rel=preload as=image imagesrcset="cropped-big.jpg 800w, cropped-small.jpg 400w">

How can you tell if this is one "picture" or two "picture"s?

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domfarolino commented Sep 26, 2018

Hmm, well I think it should not matter IIUC. The HTML in your example has potential of fetching two images, and I think any number of <img> or <picture> elements could fetch images that match the ones fetched + cached by the preloads? Or am I not understanding this correctly..

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eeeps commented Sep 26, 2018

The HTML in the example [edit: to clear up confusion – in the picture example!] will only load one image. The srcset from the first matching <source> is used; after a match, subsequent <source>s and the <img srcset> are discarded.

But, you could relatively-easily make your <link media>s mutually exclusive:

<link rel=preload as=image media="(min-width: 800px)" imagesrcset="big.jpg 1200w, small.jpg 600w">
<link rel=preload as=image media="(max-width: 799px)" imagesrcset="cropped-big.jpg 800w, cropped-small.jpg 400w">

But! I don't know how you could do the same thing for type...?

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domfarolino commented Sep 27, 2018

Gotcha. Yes it is a problem that the HTML @zcorpan provided will preload two images (assuming link media matches), even though the <picture> that both are intended for will only request one. So yeah, the link not having context of eventually-associated <picture>s can lead to a lot of unused preloads, which is quite bad for perf. Might be good to get some ideas on how to maybe make the association, so we don't have to tell devs to make their medias mutually exclusive in these contexts or something, just for the sake of being able to preload. (It'd be nice if the barrier for entry to preload responsive images were pretty low). Paging @irori for some ideas maybe, as he's recently worked on Chrome's impl.

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zcorpan commented Sep 27, 2018

How about adding a new as value? The processing of as=image would then look at previous siblings with as=source until a sibling is found that is not a link with as=source.

<link rel=preload as=source media="(min-width: 800px)" imagesrcset="big.jpg 1200w, small.jpg 600w">
<link rel=preload as=image imagesrcset="cropped-big.jpg 800w, cropped-small.jpg 400w">
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domfarolino commented Sep 27, 2018

Ok, so:

<link rel=preload as=source media="(min-width: 800px)" imagesrcset="a...">
<link rel=preload as=image imagesrcset="cropped-a...">
<link rel=preload as=source media="(min-width: 800px)" imagesrcset="b...">
<link rel=preload as=image imagesrcset="cropped-b...">
<link rel=preload as=source media="(min-width: 800px)" imagesrcset="c...">
<link rel=preload as=image imagesrcset="cropped-c...">

...would preload three images, because processing <link rel=preload as=source> would not load anything, and would only be considered upon processing the next <link rel=preload as=image>, as an upstream sibling.

I also imagine we should say that when rel=preload && as=source:

  • href attribute must not be present, similar to what we do here for the source element
  • imagesrcset attribute must be present, similar to what we do here for the source element.

Given this, it seems we'll need a new update the source set algorithm that also takes in <link rel=preload as=image>s, in addition to the new <link rel=preload as=image> "obtain the preload resource" algorithm override.

If this is a decent enough proposal, I guess we can start trying to gather other implementer interest.

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domenic commented Sep 27, 2018

I'm stuck in meetings and can't read the above in detail, but I did just want to point out that as values are supposed to map mostly-1:1 with request destinations. It may be better to use a new rel, instead of a new as. Especially if we're changing the semantics to not be always-a-fetch as preload currently is.

I might be totally off-base due to not having read the above comments enough, and if so I apologize, but I wanted to throw this out there before people went too far.

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zcorpan commented Sep 27, 2018

I think that makes sense @domenic.

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domfarolino commented Sep 27, 2018

Ah, that's a very good point, yeah as=source kinda breaks that destination mapping. A new rel is not a bad idea.

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zcorpan commented Sep 28, 2018

How about naming it preload-source?

<link rel=preload-source media="(min-width: 800px)" imagesrcset="a...">
<link rel=preload as=image imagesrcset="cropped-a...">
<link rel=preload-source media="(min-width: 800px)" imagesrcset="b...">
<link rel=preload as=image imagesrcset="cropped-b...">
<link rel=preload-source media="(min-width: 800px)" imagesrcset="c...">
<link rel=preload as=image imagesrcset="cropped-c...">
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irori commented Oct 4, 2018

The implicit grouping of <link>s (0 or more <link rel=preload-source>s followed by a <link rel=preload as=image> forms a group) feels a little strange to me, but I can't think of a better alternative.

Perhaps we should file a new issue about the <picture> use case in w3c/preload and discuss there, while we focus on "preload for standalone <img srcset>" use-case here?

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yoavweiss commented Oct 15, 2018

I don't think we should be grouping link elements together to try and mimic <picture>. IIUC, the same functionality can be achieved by using the media attributes, and "translating" picture's "first match wins" MQs into a set of mutually-exclusive MQs.

e.g. for

<picture>
    <source media="(max-width: 800px)" srcset="800px">
    <source media="(max-width: 1600px srcset="1600px">
    <img src="larger_than_1600">
</picture>

We'll use:

<link rel=preload as=image media="(max-width: 800px)" href="800px">
<link rel=preload as=image media="(min-width: 801px) and (max-width: 1600px)" href="1600px">
<link rel=preload as=image media="(min-width: 1601px)" href="larger_than_1600">

Does that make sense? Or am I overlooking something here?

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zcorpan commented Oct 15, 2018

That makes things more difficult for authors, it's not always easy or possible to make the MQ mutually exclusive. Also type is not mutually exclusive.

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yoavweiss commented Oct 15, 2018

Fair enough. type and "exotic" MQs do indeed make things more complex...

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chrisdavidmills commented Oct 31, 2018

Docs need recorded on MDN content roadmap — https://trello.com/c/6YAMGL3B/132-html-link-element

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domfarolino commented Nov 24, 2018

A bit less of a WIP now, but still have to work out the processing model for actually selecting and requesting the image.

chromium-wpt-export-bot added a commit to web-platform-tests/wpt that referenced this pull request Nov 27, 2018

Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement
This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

chromium-wpt-export-bot added a commit to web-platform-tests/wpt that referenced this pull request Nov 27, 2018

Rename srcset/imgsizes link attributes to imagesrcset/imagesizes
This patch renames "srcset" and "imgsizes" attributes on link
to "imagesrcset" and "imagesizes" respectively, to match the latest
spec PR [1].

Note: this feature is behind experimental-web-platform-features flag.

[1] whatwg/html#4048

Bug: 813452
Change-Id: I8eabfbd734e2f29e36b7f7a3c4a32f1237b042b1
Reviewed-on: https://chromium-review.googlesource.com/c/1350414
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610782}

chromium-wpt-export-bot added a commit to web-platform-tests/wpt that referenced this pull request Nov 27, 2018

Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement
This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

@irori irori referenced this pull request Nov 29, 2018

Open

imagesrcset and imagesizes attributes on link rel=preload #329

3 of 5 tasks complete

@domfarolino domfarolino force-pushed the domfarolino/link-imagesrcset-imagesizes branch from 399faa4 to 1c1fe9f Dec 4, 2018

moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this pull request Dec 11, 2018

Bug 1509775 [wpt PR 14229] - Rename srcset/imgsizes link attributes t…
…o imagesrcset/imagesizes, a=testonly

Automatic update from web-platform-tests
Rename srcset/imgsizes link attributes to imagesrcset/imagesizes

This patch renames "srcset" and "imgsizes" attributes on link
to "imagesrcset" and "imagesizes" respectively, to match the latest
spec PR [1].

Note: this feature is behind experimental-web-platform-features flag.

[1] whatwg/html#4048

Bug: 813452
Change-Id: I8eabfbd734e2f29e36b7f7a3c4a32f1237b042b1
Reviewed-on: https://chromium-review.googlesource.com/c/1350414
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610782}

--

wpt-commits: a990dff8729c18279154f66650e83f01911216a4
wpt-pr: 14229

moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this pull request Dec 11, 2018

Bug 1509792 [wpt PR 14231] - Add imageSrcset and imageSizes IDL attri…
…butes to HTMLLinkElement, a=testonly

Automatic update from web-platform-tests
Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement

This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

--

wpt-commits: dba9026fee0e7f5294181008a91b18c29030a397
wpt-pr: 14231

xeonchen pushed a commit to xeonchen/gecko that referenced this pull request Dec 11, 2018

Bug 1509775 [wpt PR 14229] - Rename srcset/imgsizes link attributes t…
…o imagesrcset/imagesizes, a=testonly

Automatic update from web-platform-tests
Rename srcset/imgsizes link attributes to imagesrcset/imagesizes

This patch renames "srcset" and "imgsizes" attributes on link
to "imagesrcset" and "imagesizes" respectively, to match the latest
spec PR [1].

Note: this feature is behind experimental-web-platform-features flag.

[1] whatwg/html#4048

Bug: 813452
Change-Id: I8eabfbd734e2f29e36b7f7a3c4a32f1237b042b1
Reviewed-on: https://chromium-review.googlesource.com/c/1350414
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610782}

--

wpt-commits: a990dff8729c18279154f66650e83f01911216a4
wpt-pr: 14229

xeonchen pushed a commit to xeonchen/gecko that referenced this pull request Dec 11, 2018

Bug 1509792 [wpt PR 14231] - Add imageSrcset and imageSizes IDL attri…
…butes to HTMLLinkElement, a=testonly

Automatic update from web-platform-tests
Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement

This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

--

wpt-commits: dba9026fee0e7f5294181008a91b18c29030a397
wpt-pr: 14231

moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this pull request Dec 11, 2018

Bug 1509775 [wpt PR 14229] - Rename srcset/imgsizes link attributes t…
…o imagesrcset/imagesizes, a=testonly

Automatic update from web-platform-tests
Rename srcset/imgsizes link attributes to imagesrcset/imagesizes

This patch renames "srcset" and "imgsizes" attributes on link
to "imagesrcset" and "imagesizes" respectively, to match the latest
spec PR [1].

Note: this feature is behind experimental-web-platform-features flag.

[1] whatwg/html#4048

Bug: 813452
Change-Id: I8eabfbd734e2f29e36b7f7a3c4a32f1237b042b1
Reviewed-on: https://chromium-review.googlesource.com/c/1350414
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610782}

--

wpt-commits: a990dff8729c18279154f66650e83f01911216a4
wpt-pr: 14229

moz-v2v-gh pushed a commit to mozilla/gecko-dev that referenced this pull request Dec 11, 2018

Bug 1509792 [wpt PR 14231] - Add imageSrcset and imageSizes IDL attri…
…butes to HTMLLinkElement, a=testonly

Automatic update from web-platform-tests
Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement

This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

--

wpt-commits: dba9026fee0e7f5294181008a91b18c29030a397
wpt-pr: 14231

mykmelez pushed a commit to mykmelez/gecko that referenced this pull request Dec 12, 2018

Bug 1509775 [wpt PR 14229] - Rename srcset/imgsizes link attributes t…
…o imagesrcset/imagesizes, a=testonly

Automatic update from web-platform-tests
Rename srcset/imgsizes link attributes to imagesrcset/imagesizes

This patch renames "srcset" and "imgsizes" attributes on link
to "imagesrcset" and "imagesizes" respectively, to match the latest
spec PR [1].

Note: this feature is behind experimental-web-platform-features flag.

[1] whatwg/html#4048

Bug: 813452
Change-Id: I8eabfbd734e2f29e36b7f7a3c4a32f1237b042b1
Reviewed-on: https://chromium-review.googlesource.com/c/1350414
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610782}

--

wpt-commits: a990dff8729c18279154f66650e83f01911216a4
wpt-pr: 14229

mykmelez pushed a commit to mykmelez/gecko that referenced this pull request Dec 12, 2018

Bug 1509792 [wpt PR 14231] - Add imageSrcset and imageSizes IDL attri…
…butes to HTMLLinkElement, a=testonly

Automatic update from web-platform-tests
Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement

This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610990}

--

wpt-commits: dba9026fee0e7f5294181008a91b18c29030a397
wpt-pr: 14231

@domfarolino domfarolino changed the title WIP: imagesrcset and imagesizes attributes on link Attributes `imagesrcset` and `imagesizes` attributes on <link> Dec 20, 2018

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domfarolino commented Dec 20, 2018

I think this is ready for a more meticulous review @zcorpan, /cc @annevk for link rel="preload" changes. The PR:

  • Introduces the imagesrcset and imagesizes attributes for <link>s
  • Gives <link>s the concept of source set and sizes attributes
  • Allows the select an image source and update the source set algorithms to run on <link>s
  • Introduces an obtain the preload resource algorithm, which delegates to the more-general obtain the resource algorithm when as != "image"

The Preload Spec should refer to the obtain the preload resource algorithm instead of the more-general obtain the resource algorithm, and w3c/preload#134 takes care of this, if this route is ultimately accepted.

Note: I realize the obtain the preload resource and obtain the resource algorithms have several identical steps. If it is preferred, I can either factor them out somewhere to reduce duplication, or jam the image-preload-specific logic in the general obtain the resource. I didn't opt into the latter just because I didn't want to make the algorithm more cluttered.

Bugs:

@domfarolino domfarolino requested a review from annevk Dec 20, 2018

<p>The <dfn><code data-x="attr-link-imagesrcset">imagesrcset</code></dfn> attribute may be
present, and is a <span>srcset attribute</span>.</p>

<p>The <code data-x="attr-link-imagesrcset">imagesrcset</code> and the <code

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<p>The <code data-x="attr-link-imagesrcset">imagesrcset</code> and the <code

Should have <code data-x="attr-link-imagesrcset">imagesrcset</code> attribute

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Thanks. Personally I prefer to have: "The imagesrcset and the href attributes ...." (notice plural "attributes" now). Would that be alright, or do you still prefer having "attribute" in both places?

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Yeah, "The imagesrcset and the href attributes ...." is fine too — though if you do it that way, I think it would be better to drop the the before attributes. So, "The imagesrcset and href attributes ....". To me at least, that’s more idiomatic (and I think it’s also more consistent with how we’ve done the styling of existing such cases in the spec).

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annevk commented Jan 3, 2019

So what is the setup? A link element is inserted, we look at the rel attribute value, and then dispatch to an appropriate obtain algorithm? (I'm not seeing the dispatching in this PR.) Shouldn't the general obtain algorithm dispatch to more specific variants?

@annevk annevk requested a review from zcorpan Jan 3, 2019

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domfarolino commented Jan 3, 2019

Something like that. Yeah sorry, the infra is not quite in place yet. Meant to leave a comment last week indicating that I'm blocking this on #4031 which I'll be finishing soon, as this change is going to take advantage of some of the added infra.

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zcorpan approved these changes Jan 9, 2019

density that results from <span data-x="select an image source">selecting an image
source</span>, respectively.</p></li>

<li><p>If <var>selected source</var> is null, return.</p></li>

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then return.

must match the <span>intrinsic width</span> in the resource given by the
<span>image candidate string</span>'s URL, if it has an <span>intrinsic width</span>.</p>
element must also have the <span>width descriptor</span> specified, and the element's <span>sizes
attribute</span> must be present.</p>

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I thought this was already required (that sizes must be present), but can't find it in the current spec. Maybe it regressed at some point?

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domfarolino commented Jan 14, 2019

Adding a note here reminding me to make the preload check in the [default fetch and process the linked resource] algorithm into custom preload fetch steps after this gets rebased on top of #4031.

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