1846251 - [css-nesting] Make CSSStyleRule a CSSGroupingRule

Status: RESOLVED FIXED

(Core :: DOM: CSS Object Model, defect)

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Attachment: Bug 1846251 - Make CSSStyleRule inherit from CSSGroupingRule. r=#style,#layout,peterv

As per https://github.com/w3c/csswg-drafts/issues/8940.

I didn't do this in bug 1837638 because that's what the spec said at the
time, that's what other browsers did, and specially because if we did
this we had no way of runtime-disable nesting during development or if
things went south.

This means that we can't keep the nesting pref in 118, but that seems
fine (it's already enabled everywhere in 117).

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/085c31f150d3
Make CSSStyleRule inherit from CSSGroupingRule. r=peterv,devtools-reviewers

Comment 3

[Web Platform Test Sync Bot (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/41248 for changes under testing/web-platform/tests

Comment 4

[Iulian Moraru]

Backed out for causing CSSStyleRule related wpt failures.

• Push with failures

• Failure log

• Backout link

[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - TEST-PASS | /css/cssom/idlharness.html | CSSRule interface: constant NAMESPACE_RULE on interface prototype object 
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - TEST-UNEXPECTED-FAIL | /css/cssom/idlharness.html | CSSStyleRule interface: existence and properties of interface object - assert_equals: prototype of CSSStyleRule is not CSSRule expected function "function CSSRule() {
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO -     [native code]
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - }" but got function "function CSSGroupingRule() {
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO -     [native code]
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - }"
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - IdlInterface.prototype.test_self/<@http://web-platform.test:8000/resources/idlharness.js:1516:30
[task 2023-07-31T22:35:09.887Z] 22:35:09     INFO - Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2599:25
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - test@http://web-platform.test:8000/resources/testharness.js:628:30
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - self.subsetTestByKey@http://web-platform.test:8000/resources/idlharness.js:44:14
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - IdlInterface.prototype.test_self@http://web-platform.test:8000/resources/idlharness.js:1453:20
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - IdlInterface.prototype.test@http://web-platform.test:8000/resources/idlharness.js:1433:14
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - IdlArray.prototype.test@http://web-platform.test:8000/resources/idlharness.js:748:28
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - idl_test/</<@http://web-platform.test:8000/resources/idlharness.js:3529:31
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - 
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - TEST-PASS | /css/cssom/idlharness.html | CSSStyleRule interface object length 
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - TEST-PASS | /css/cssom/idlharness.html | CSSStyleRule interface object name 
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - TEST-UNEXPECTED-FAIL | /css/cssom/idlharness.html | CSSStyleRule interface: existence and properties of interface prototype object - assert_equals: prototype of CSSStyleRule.prototype is not CSSRule.prototype expected object "[object CSSRule]" but got object "[object CSSGroupingRule]"
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - IdlInterface.prototype.test_self/<@http://web-platform.test:8000/resources/idlharness.js:1845:30
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2599:25
[task 2023-07-31T22:35:09.888Z] 22:35:09     INFO - test@http://web-platform.test:8000/resources/testharness.js:628:30
[task 2023-07-31T22:35:09.889Z] 22:35:09     INFO - self.subsetTestByKey@http://web-platform.test:8000/resources/idlharness.js:44:14
[task 2023-07-31T22:35:09.889Z] 22:35:09     INFO - IdlInterface.prototype.test_self@http://web-platform.test:8000/resources/idlharness.js:1761:20
[task 2023-07-31T22:35:09.889Z] 22:35:09     INFO - IdlInterface.prototype.test@http://web-platform.test:8000/resources/idlharness.js:1433:14
[task 2023-07-31T22:35:09.889Z] 22:35:09     INFO - IdlArray.prototype.test@http://web-platform.test:8000/resources/idlharness.js:748:28
[task 2023-07-31T22:35:09.889Z] 22:35:09     INFO - idl_test/</<@http://web-platform.test:8000/resources/idlharness.js:3529:31
[task 2023-07-31T22:35:10.023Z] 22:35:10     INFO - .....................................................................................................................................................................................................................................................................................
[task 2023-07-31T22:35:10.023Z] 22:35:10     INFO - TEST-OK | /css/cssom/idlharness.html | took 3414ms

Comment 5

[Web Platform Test Sync Bot (Matrix: #interop:mozilla.org)]

Upstream PR was closed without merging

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/62534bac9235
Make CSSStyleRule inherit from CSSGroupingRule. r=peterv,devtools-reviewers

Comment 7

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/62534bac9235

Comment 8

[Web Platform Test Sync Bot (Matrix: #interop:mozilla.org)]

Upstream PR merged by moz-wptsync-bot

Comment 9

[Julian Descottes [:jdescottes]]

== Change summary for alert #39205 (as of Thu, 03 Aug 2023 01:55:56 GMT) ==

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
18%	damp custom.styleeditor.open.DAMP	linux1804-64-shippable-qr	e10s fission stylo webrender-sw	750.10 -> 881.42
17%	damp custom.styleeditor.open.DAMP	linux1804-64-shippable-qr	e10s fission stylo webrender	767.34 -> 897.32
13%	damp custom.styleeditor.open.DAMP	windows10-64-shippable-qr	e10s fission stylo webrender-sw	620.02 -> 701.28
12%	damp custom.styleeditor.open.DAMP	windows10-64-shippable-qr	e10s fission stylo webrender	628.97 -> 705.52

For up to date results, see: https://treeherder.mozilla.org/perfherder/alerts?id=39205

Comment 10

[Hamish Willee]

FF118 MDN docs work for this can be tracked in https://github.com/mdn/content/issues/28853 (work fairly minimal and effectively complete).