1629278 - [wpt-sync] Sync PR 22874 - Hide the .content() property for declarative shadow roots

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, task, P4)

Description

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

Sync web-platform-tests PR 22874 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/22874
Details from upstream follow.

Mason Freed <[e-mail]> wrote:

Hide the .content() property for declarative shadow roots

With this CL, the .content() property of a declarative shadow root
(a \<template shadowroot="open|closed"> element being parsed) will return
null. Note that this \<template> element only exists during parsing,
and upon the closing \</template> tag being encountered by the parser,
the shadowroot will be created, the \<template> contents will be moved
into the shadowroot, and the \<template> itself will be deleted. So
this change is only visible from MutationObservers and other script
that runs during parsing. This CL prevents that script from accessing
the contents of the (potentially closed) shadow root.

See point #1 at [1] for more context.

[1] https://github.com/whatwg/dom/issues/831#issuecomment-608129380

Bug: 1042130
Change-Id: Id096d1b65dc94b7a75afdc6143341eb4521da41a
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/2133308
WPT-Export-Revision: d2ee0676503dd4118b9ce2666274a9c95c43542b

Comment 1

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

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=645e1b029f2a2c1a1a1d192460e925c407967bcd

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7a8bc5291980
[wpt PR 22874] - Hide the .content() property for declarative shadow roots, a=testonly
https://hg.mozilla.org/integration/autoland/rev/5333249adfda
[wpt PR 22874] - Update wpt metadata, a=testonly

Comment 3

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

Test result changes from PR not available.

Comment 4

[Arthur Iakab [arthur_iakab]]

https://hg.mozilla.org/mozilla-central/rev/7a8bc5291980
https://hg.mozilla.org/mozilla-central/rev/5333249adfda