[selectors] The forgiving nature of :has breaks jQuery when used with a complex :has selector #7676

mgol · 2022-09-02T10:54:16Z

The fact that the native :has pseudo-class:
https://drafts.csswg.org/selectors/#relational
takes forgiving-relative-selector-list as an argument:
https://drafts.csswg.org/selectors/#forgiving-selector
means the contents are not validated.

jQuery has supported the :has pseudo-class for ages. However, its support is more powerful; in particular, it allows for jQuery extensions like :contains to appear within :has.

The way the jQuery selector engine works (and have worked for a long time), the selector is tried against querySelectorAll with minor modifications and if it throws, it goes through the internal selector engine. It's either-or.

Since selectors like ul:has(li:contains('Item')) no longer throw in Chrome, jQuery defers to querySelectorAll and such a selector returns 0 results even if the jQuery path should match something.

We can of course try to patch it in jQuery, perhaps defaulting selectors containing :has to use the jQuery selector engine. But it won't help countless apps using older jQuery versions. So I wanted to bring it for consideration for the standards committee. I understand if the decision is going to be "no changes in the spec are planned" but it'd be good to have this discussion and the decision made knowing the consequences.

As you can see, it didn't take long after the Chrome 105 release for us to get a bug report about this breakage:
jquery/jquery#5098
Implementing :has according to the spec makes the browser break the jQuery test suite right now.

The text was updated successfully, but these errors were encountered:

mgol · 2022-09-02T10:56:58Z

It's worth noting this affects all jQuery versions from 1.3 released in January, 2009 to the current 3.6.1 released a few days ago.

lilles · 2022-09-02T11:06:59Z

This did not break with Safari shipping, because WebKit did not implement using forgiving selector list per spec: https://bugs.webkit.org/show_bug.cgi?id=244708

lilles · 2022-09-02T12:09:49Z

@byung-woo @anttijk @emilio

byung-woo · 2022-09-02T12:27:59Z

Even if we make the :has() unforgiving, it seems that there can be still same issues in :has(:is(.a:has(.b), .c)) since :is() is forgiving. (It seems that @lilles already asked about this here : jquery/jquery#5098 (comment))

anttijk · 2022-09-02T12:36:19Z

The current WebKit behavior (not by design) is to use forgiving parsing but fail the selector if the selector list ends up empty. That is

:has(:foo, bar) { }

is valid and parses to

:has(bar) { }

but

:has(:foo) is invalid.

Perhaps this is actually the best option considering the jQuery issue.

emilio · 2022-09-02T12:54:55Z

The way the jQuery selector engine works (and have worked for a long time), the selector is tried against querySelectorAll with minor modifications and if it fails, it goes through the internal selector engine. It's either-or.

Shouldn't jQuery check CSS.supports("selector(:has(....))"), which should be unforgiving per spec? See #7280

byung-woo · 2022-09-02T15:01:24Z

Shouldn't jQuery check CSS.supports("selector(:has(....))"), which should be unforgiving per spec? See #7280

I agree that this is the correct way to validate :has() usage, but it's sad that even if JQuery applies this to the new version, there may be unexpected regressions when someone uses an older JQuery version. :(

Now I'm trying to merge a fix to Chrome to avoid existing JQuery conflict by following the WebKit's behavior. But I think that we need a way to handle this situation properly.

The one way I can imagine is to rename the pseudo class name in the spec so that there will not be any conflict with existing JQuery implementation (:has() -> :some-other-good-name())

emilio · 2022-09-02T16:04:37Z

Is there any real-world site broken by the change? How frequent do we expect it to be to use jQuery-specific selectors inside :has() to begin with?

emilio · 2022-09-02T16:05:51Z

Also, is this a "recent version of jQuery" kinda thing? Or would this change cause issues on older jQuery versions?

emilio · 2022-09-02T16:07:46Z

If there's no real-world breakage, it might be worth just getting jQuery fixed by using CSS.supports(), rather than introduce a weird quirk in how :has() works vs. other modern selectors...

mgol · 2022-09-02T16:49:08Z

@emilio

Shouldn't jQuery check CSS.supports("selector(:has(....))"), which should be unforgiving per spec? See #7280

In Chrome 105, CSS.supports('selector(:has(div:contains(div)))') returns true. I'd gladly use this in jQuery if this was working as advertised.

Also, is this a "recent version of jQuery" kinda thing? Or would this change cause issues on older jQuery versions?

As I wrote in #7676 (comment), this affects virtually all jQuery versions used in the wild.

Is there any real-world site broken by the change? How frequent do we expect it to be to use jQuery-specific selectors inside :has() to begin with?

I am unable to answer this question. But it did both break our test suite and get us a report from a user at jquery/jquery#5098. @Rinzwind did you encounter this issue just in manual testing or did it actually break anything for you on a live site?

mgol · 2022-09-02T17:01:22Z

@byung-woo

Now I'm trying to merge a fix to Chrome to avoid existing JQuery conflict by following the WebKit's behavior. But I think that we need a way to handle this situation properly.

Note that the WebKit behavior still breaks some jQuery selectors. True, it doesn't break:

div:has(span:contains('Item'))

but it still breaks:

div:has(div, span:contains('Item'))

Maybe that latter kind of selectors is not used as often in the wild.

Workaround to avoid JQuery :has() issue: - w3c/csswg-drafts#7676 This CL follows the current WebKit behavior: Parse :has() as forgiving, but make it invalid when all the arguments are dropped. - csswg-drafts/issues/7676#issuecomment-1235450787 Bug: 1358953 Change-Id: Ib6bf08a6c3320585eb80e1761e852e530c369bd2 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3868781 Commit-Queue: Byungwoo Lee <blee@igalia.com> Reviewed-by: Rune Lillesveen <futhark@chromium.org> Cr-Commit-Position: refs/heads/main@{#1042628}

lilles · 2022-09-02T17:21:28Z

Opened issue for CSS.supports()/@supports: https://bugs.chromium.org/p/chromium/issues/detail?id=1359396

lilles · 2022-09-02T17:28:09Z

There is a real-world breakage reported here: https://crbug.com/1359246

Rinzwind · 2022-09-02T17:38:34Z

@Rinzwind did you encounter this issue just in manual testing or did it actually break anything for you on a live site?

In our case, none of the selectors used in the application itself seem to be affected by this problem, only the ones in our automated tests (see: jquery/jquery#5098 (comment)).

tabatkins · 2022-09-02T18:01:22Z

Importantly, this is not specific to :has(), and so any change to :has() won't stop the breakage. This breakage is due to the nature of forgiving-selector-list in general, so any place that uses it (like :is(), as Byungwoo notes), will trigger the exact same problem - jQuery users putting jQuery-specific selectors into an :is() will similarly bypass the current check and stick with the browser's selector behavior. The :has()-specific part is just that :has() already exists as a jQuery-custom selector, while :is() doesn't, so older content using :has() will break. That said, new content using :is() with older jQuery versions will also continue to get the bad behavior.

So our options are:

Rename :has() to not overlap with the jQuery name, so older content using older jQuery versions will continue to trigger the custom code path rather than use built-ins.
Give up on forgiving-selector-list entirely, switching :is() and :has() to the unforgiving behavior, and never using it again.
Accept that older versions of jQuery can cause page breakage, if you use custom jQuery selectors inside of :has() (or nest :has(), which is allowed in jQuery)

All three options suck! Unless the breakage gets fairly bad, tho, I do lean toward 3. The :has() name is very nice and already widely socialized, and I'd be extremely loathe to give up on forgiving-selector-list.

mgol · 2022-09-02T18:41:17Z

BTW, re:

Now I'm trying to merge a fix to Chrome to avoid existing JQuery conflict by following the WebKit's behavior. But I think that we need a way to handle this situation properly.

What use cases exist that make it useful to have :has forgiving that do not also require not following the WebKit behavior of throwing if none of the :has contents use only supported selectors?

The fact that in WebKit qSA('div:has(:foo)') throws while qSA('div:has(:foo, span)') does not is more confusing to me than either not throwing in both cases or throwing in both. It'd be good to learn if there are any arguments for this split to be good for the Web before Chrome jumps in to copy WebKit here and that behavior has to be standardized.

mgol · 2022-09-02T22:52:05Z

@tabatkins

jQuery users putting jQuery-specific selectors into an :is() will similarly bypass the current check and stick with the browser's selector behavior

Because the jQuery selector engine currently works via a binary switch - first, check qSA; if it throws, use the jQuery custom traversal - and because jQuery never implemented :is(), the behavior change is only that before :is() got implemented a selector like :is(div:contains("Foo")) would throw and once :is() got implemented it started returning 0 results. So there's a change but one unlikely to cause a breakage, contrary to the :has() situation.

Does Google have any way to collect metrics of how often :has is used with jQuery-specific pseudos like :contains? That would help a lot.

andruud · 2022-09-06T07:42:27Z

Does Google have any way to collect metrics of how often :has is used with jQuery-specific pseudos like :contains? That would help a lot.

@mgol We could query HTTP Archive. What are we looking for?

:has(.*:contains.*)
What else?

mgol · 2022-09-06T09:02:57Z

@andruud

We could query HTTP Archive. What are we looking for?
* `:has(.*:contains.*)`

* What else?

Any jQuery-specific pseudo inside of :has(), including:

positional pseudos: :first, :last, :eq, :even, :odd, :lt, :gt, and :nth
other jQuery-specific ones: :contains, :parent, :header, :input, :button, :text, :radio, :checkbox, :file, :password, :image, :submit, :reset, :animated - I think those are not available natively
native ones but not available in :has natively: :has (yes, nested)

There are other native ones also implemented by jQuery but those are probably fine? :not, :lang, :target, :root, :focus, :enabled, :disabled, :checked, :selected, :empty

_{EDIT: Updated based on the comment from @SelenIT}

SelenIT · 2022-09-06T14:06:19Z

@mgol isn't :not available in :has? The spec apparently suggests it's allowed (see Example 15). Are there any extra implementation-specific limitations?

andruud · 2022-09-06T18:40:20Z

Give up on forgiving-selector-list entirely, switching :is() and :has() to the unforgiving behavior, and never using it again.

@tabatkins What about the following?

2b. Don't give up on forgiving-selector-list entirely, but spec the current Safari behavior. I.e. make :has() invalid if all the arguments are invalid.

... provided that it avoids enough problems to be worth it. (As I understand it doesn't fully solve the issue).

emilio · 2022-09-06T18:45:47Z

That seems rather unfortunate fwiw, I'd much rather make them behave consistently regardless of the number of valid arguments...

If we had something like that I think I'd prefer making it unforgiving iff the number of provided arguments is exactly one, rather than making it depend on the number of valid arguments. But still unfortunate IMHO

lilles · 2022-09-07T07:08:46Z

So making:

div.class:has(:invalid, :invalid) {}

invalid instead of never matching wouldn't be too bad, but the consequence of dropping other fully valid selectors from a list, which would happen with main.class in:

main.class, div.class:has(:invalid, :invalid) {}

is more problematic.

mgol · 2022-09-07T09:00:27Z

@SelenIT

@mgol isn't :not available in :has? The spec apparently suggests it's allowed (see Example 15). Are there any extra implementation-specific limitations?

You are right. What's not supported natively is nested :has(), :not() in :has() seems fine.

I updated the comment.

Resolved in <w3c/csswg-drafts#7676>

Automatic update from web-platform-tests Make :has() unforgiving Apply the issue resolution of making :has() unforgiving: w3c/csswg-drafts#7676 (comment) Bug: 1399744 Change-Id: Ibb499e251ecce7ba22bd454ea94b2c8c8b1d8afb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4090967 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Byungwoo Lee <blee@igalia.com> Cr-Commit-Position: refs/heads/main@{#1081452} -- wpt-commits: 37e131cadfd27444fa4223b826edbd6bed29c356 wpt-pr: 37423

Apply the issue resolution of making :has() unforgiving: w3c/csswg-drafts#7676 (comment) Bug: 1399744 Change-Id: Ibb499e251ecce7ba22bd454ea94b2c8c8b1d8afb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4090967 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Byungwoo Lee <blee@igalia.com> Cr-Commit-Position: refs/heads/main@{#1081452}

jQuery has followed the following logic for selector handling for ages: 1. Modify the selector to adhere to scoping rules jQuery mandates. 2. Try `qSA` on the modified selector. If it succeeds, use the results. 3. If `qSA` threw an error, run the jQuery custom traversal instead. It worked fine so far but now CSS has a concept of forgiving selector lists that some selectors like `:is()` & `:has()` use. That means providing unrecognized selectors as parameters to `:is()` & `:has()` no longer throws an error, it will just return no results. That made browsers with native `:has()` support break selectors using jQuery extensions inside, e.g. `:has(:contains("Item"))`. Detecting support for selectors can also be done via: ```js CSS.supports( "selector(SELECTOR_TO_BE_TESTED)" ) ``` which returns a boolean. There was a recent spec change requiring this API to always use non-forgiving parsing: w3c/csswg-drafts#7280 (comment) However, no browsers have implemented this change so far. To solve this, two changes are being made: 1. In browsers supports the new spec change to `CSS.supports( "selector()" )`, use it before trying `qSA`. 2. Otherwise, add `:has` to the buggy selectors list. Ref jquerygh-5098 Ref jquerygh-5107 Ref jquery/sizzle#486 Ref w3c/csswg-drafts#7676

Automatic update from web-platform-tests Make :has() unforgiving Apply the issue resolution of making :has() unforgiving: w3c/csswg-drafts#7676 (comment) Bug: 1399744 Change-Id: Ibb499e251ecce7ba22bd454ea94b2c8c8b1d8afb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4090967 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Byungwoo Lee <blee@igalia.com> Cr-Commit-Position: refs/heads/main@{#1081452} -- wpt-commits: 37e131cadfd27444fa4223b826edbd6bed29c356 wpt-pr: 37423

https://bugs.webkit.org/show_bug.cgi?id=249914 rdar://103733208 Reviewed by Antti Koivisto. Following CSSWG resolution: w3c/csswg-drafts#7676 (comment) In order to unbreak jQuery. * LayoutTests/imported/w3c/web-platform-tests/css/selectors/parsing/parse-has-expected.txt: * Source/WebCore/css/parser/CSSSelectorParser.cpp: (WebCore::CSSSelectorParser::consumeRelativeSelectorList): (WebCore::CSSSelectorParser::consumePseudo): (WebCore::CSSSelectorParser::consumeForgivingRelativeSelectorList): Deleted. * Source/WebCore/css/parser/CSSSelectorParser.h: Canonical link: https://commits.webkit.org/258712@main

…st-child() unforgiving. w3c#7676

…ngParsing Enable these two features by default. CSSAtSupportsAlwaysNonForgivingParsing: - Apply the csswg issue resolution: change '@supports' selector parsing. - w3c/csswg-drafts#7280 (comment) CSSPseudoHasNonForgivingParsing: - Apply the csswg issue resolution: make ':has()' non-forgiving. - w3c/csswg-drafts#7676 (comment) Intent-to-ship: https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/RJrIxJA9LYw Bug: 1359396, 1399744 Change-Id: I179f22074f5cf6c9c8d56e36a4e3360bfe892256 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4224863 Reviewed-by: Rune Lillesveen <futhark@chromium.org> Commit-Queue: Byungwoo Lee <blee@igalia.com> Cr-Commit-Position: refs/heads/main@{#1102139}

mgol · 2023-02-08T15:53:42Z

I have some doubts about the generic recommendation of wrapping with :is() or :where() to get forgiveness; I submitted an issue about this: #8430.

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. The PR also updates `playwright-webkit` so that we test against a version of WebKit that already has non-forgiving `:has()`. Fixes jquerygh-5194 Ref jquerygh-5098 Ref jquerygh-5107 Ref w3c/csswg-drafts#7676

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. Fixes jquery/jquery#5194 Ref jquery/jquery#5098 Ref jquerygh-486 Ref w3c/csswg-drafts#7676

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. The PR also updates `playwright-webkit` so that we test against a version of WebKit that already has non-forgiving `:has()`. Fixes jquerygh-5194 Ref jquerygh-5098 Ref jquerygh-5107 Ref w3c/csswg-drafts#7676

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. Fixes jquery/jquery#5194 Ref jquery/jquery#5098 Ref jquerygh-486 Ref w3c/csswg-drafts#7676

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. The PR also updates `playwright-webkit` so that we test against a version of WebKit that already has non-forgiving `:has()`. Fixes gh-5194 Closes gh-5206 Ref gh-5098 Ref gh-5107 Ref w3c/csswg-drafts#7676 Co-authored-by: Richard Gibson <richard.gibson@gmail.com>

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. The PR also updates `playwright-webkit` so that we test against a version of WebKit that already has non-forgiving `:has()`. Fixes gh-5194 Closes gh-5207 Ref gh-5206 Ref gh-5098 Ref gh-5107 Ref w3c/csswg-drafts#7676

`CSS.supports( "selector(...)" )` has different semantics than selectors passed to `querySelectorAll`. Apart from the fact that the former returns `false` for unrecognized selectors and the latter throws, `qSA` is more forgiving and accepts some invalid selectors, auto-correcting them where needed - for example, mismatched brackers are auto-closed. This behavior difference is breaking for many users. To add to that, a recent CSSWG resolution made `:is()` & `:where()` the only pseudos with forgiving parsing; browsers are in the process of making `:has()` parsing unforgiving. Taking all that into account, we go back to our previous try-catch approach without relying on `CSS.supports( "selector(...)" )`. The only difference is we detect forgiving parsing in `:has()` and mark the selector as buggy. Fixes jquery/jquery#5194 Closes gh-493 Ref jquery/jquery#5098 Ref jquery/jquery#5206 Ref jquery/jquery#5207 Ref gh-486 Ref w3c/csswg-drafts#7676

mgol mentioned this issue Sep 2, 2022

Selector :contains within :has seems broken on Chrome jquery/jquery#5098

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lilles added the Agenda+ label Sep 2, 2022

Loirooriol added the selectors-4 Current Work label Sep 5, 2022

romainmenke mentioned this issue Sep 6, 2022

Define guidelines for preprocessors, libraries, frameworks #7150

Open

tabatkins added a commit to web-platform-tests/wpt that referenced this issue Dec 9, 2022

:has() is unforgiving now

e85451b

Resolved in <w3c/csswg-drafts#7676>

tabatkins mentioned this issue Dec 9, 2022

:has() is unforgiving now web-platform-tests/wpt#37433

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nt1m mentioned this issue Jan 10, 2023

[:has() pseudo-class] Use unforgiving parsing for selector list WebKit/WebKit#8428

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jakearchibald pushed a commit to jakearchibald/csswg-drafts that referenced this issue Jan 16, 2023

[selectors-4] Per WG resolution, make :has() and :nth-child()/:nth-la…

c5eba92

…st-child() unforgiving. w3c#7676

bramus mentioned this issue Jan 21, 2023

Missing support for :has() pseudo-class dperini/nwsapi#72

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mgol mentioned this issue Jan 30, 2023

[selectors] May new pseudos using forgiving parsing be introduced in the future? #8378

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mgol mentioned this issue Feb 8, 2023

[selectors] Wrapping with :is() to get forgiveness changes semantics #8430

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mgol mentioned this issue Feb 9, 2023

Selector: Stop relying on CSS.supports( "selector(...)" ) jquery/jquery#5206

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mgol mentioned this issue Feb 9, 2023

Selector: Stop relying on CSS.supports( "selector(...)" ) jquery/jquery#5207

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faceless2 mentioned this issue Feb 10, 2023

[selectors] Validity of selectors nesting :has(), :is() and :has() #8441

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Selector: Stop relying on CSS.supports( "selector(...)" ) jquery/sizzle#493

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[css-cascade-6] Should @scope's <scope-start> & <scope-end> be unforgiving? #10042

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[selectors] The forgiving nature of :has breaks jQuery when used with a complex :has selector #7676

[selectors] The forgiving nature of :has breaks jQuery when used with a complex :has selector #7676

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[selectors] The forgiving nature of :has breaks jQuery when used with a complex :has selector #7676

[selectors] The forgiving nature of :has breaks jQuery when used with a complex :has selector #7676

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