2039325 - Allow style sharing across shadow roots.

Status: RESOLVED FIXED

(Core :: CSS Parsing and Computation, task, P3)

Comment 1

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 2039325 - Allow style sharing across shadow roots. r=#style

In TodoMVC-WebComponents, all 100 todo-item shadow roots use the same
adoptedStyleSheets=[globalStyles, itemStyles], so they share the same
Arc<CascadeData>.

This allows styles resolved in one shadow root to be shared with
corresponding elements in other shadow roots.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/bf8feb077233
https://hg.mozilla.org/integration/autoland/rev/7faf45fdfae5
Allow style sharing across shadow roots. r=firefox-style-system-reviewers,dshin

Comment 3

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/7faf45fdfae5

Comment 4

[Florin Bilt]

(In reply to Serban Stanca [:SerbanS] from comment #3)

https://hg.mozilla.org/mozilla-central/rev/7faf45fdfae5

Perfherder has detected a browsertime performance change from push 7faf45fdfae598eadd69e71d6ac11bc61c93c2c4.

No action is required from the author; this comment is provided for informational purposes only.

Improvement	Test	Platform	Options	Absolute values [old vs new]	Performance Profiles
6%	speedometer3 TodoMVC-WebComponents/total (doc)	macosx1500-aarch64-shippable	fission webrender	9.59 ms -> 9.03 ms	Before/After

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Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.