Bug 1876932 [wpt PR 44247] - Make shallow clone work when clonable is true, a=testonly

Automatic update from web-platform-tests
Make shallow clone work when clonable is true

This did not previously work correctly, but now, this will
work:

const shadow = host.attachShadow({mode:'open', clonable:true});
host.cloneNode(false);

The behavior is for the shadow root to be deep-cloned, even though
the `deep` argument to `cloneNode()` is `false`.

See this discussion for more context:
  whatwg/dom#1249

and this summary of the consensus:
  whatwg/dom#1249 (comment)

Bug: 1510466
Change-Id: I8a9de78044785675cd6bbac93d9b26286445ac8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5242239
Reviewed-by: David Baron <dbaronchromium.org>
Auto-Submit: Mason Freed <masonfchromium.org>
Commit-Queue: Mason Freed <masonfchromium.org>
Cr-Commit-Position: refs/heads/main{#1254312}

--

wpt-commits: bf7b1d88809248c70531b45d7c202a1fc7993d2d
wpt-pr: 44247

UltraBlame original commit: ad7d9de7a73983abcd2ba32c270f068283e5104c

Author: marco-c

testing/web-platform/tests/shadow-dom/shadow-root-clonable.html

@@ -79,6 +79,37 @@
 '
 >
 <
+link
+rel
+=
+'
+help
+'
+href
+=
+'
+https
+:
+/
+/
+github
+.
+com
+/
+whatwg
+/
+dom
+/
+issues
+/
+1249
+#
+issuecomment
+-
+1917772229
+'
+>
+<
 script
 src
 =
@@ -158,17 +189,27 @@
 ;
 root
 .
-appendChild
-(
-document
-.
-createElement
-(
-"
+innerHTML
+=
+'
+<
 input
-"
-)
-)
+>
+<
+div
+>
+<
+span
+>
+<
+/
+span
+>
+<
+/
+div
+>
+'
 ;
 assert_true
 (
@@ -220,7 +261,7 @@
 children
 .
 length
-1
+2
 "
 children
 count
@@ -246,6 +287,122 @@
 "
 )
 ;
+assert_equals
+(
+clonedRoot
+.
+children
+[
+1
+]
+.
+firstElementChild
+.
+localName
+"
+span
+"
+"
+grandchildren
+content
+"
+)
+;
+const
+shallowClone
+=
+div
+.
+cloneNode
+(
+false
+)
+;
+const
+shallowClonedRoot
+=
+shallowClone
+.
+shadowRoot
+;
+assert_true
+(
+shallowClonedRoot
+.
+clonable
+"
+clone
+gets
+the
+same
+clonable
+state
+"
+)
+;
+assert_equals
+(
+shallowClonedRoot
+.
+children
+.
+length
+2
+"
+shallow
+clone
+still
+deep
+-
+clones
+the
+shadow
+root
+"
+)
+;
+assert_equals
+(
+shallowClonedRoot
+.
+children
+[
+0
+]
+.
+localName
+"
+input
+"
+"
+shadow
+children
+content
+"
+)
+;
+assert_equals
+(
+shallowClonedRoot
+.
+children
+[
+1
+]
+.
+firstElementChild
+.
+localName
+"
+span
+"
+"
+shadow
+grandchildren
+content
+"
+)
+;
 }
 "
 attachShadow