Bug 1556697 [wpt PR 17162] - custom-elements: Add a test for upgrade …

…failure due to non-null shado…, a=testonly

Automatic update from web-platform-tests
HTML: test upgrade custom element failure due to disabledFeatures

Specification PR: whatwg/html#4673.
--

wp5At-commits: a3dcc65d854e242e61aeb1c68c26742cd278ea9a
wpt-pr: 17162

UltraBlame original commit: d029a500f958bb1754e910cabdb554615bd43064

testing/web-platform/tests/custom-elements/upgrading.html

@@ -254,6 +254,15 @@
 <
 script
 >
+setup
+(
+{
+allow_uncaught_exception
+:
+true
+}
+)
+;
 class
 PredefinedCustomElement
 extends
@@ -1893,6 +1902,175 @@
 }
 )
 ;
+test
+(
+(
+)
+=
+>
+{
+class
+ShadowDisabledElement
+extends
+HTMLElement
+{
+static
+get
+disabledFeatures
+(
+)
+{
+return
+[
+'
+shadow
+'
+]
+;
+}
+}
+let
+error
+=
+null
+;
+window
+.
+addEventListener
+(
+'
+error
+'
+e
+=
+>
+{
+error
+=
+e
+.
+error
+;
+}
+{
+once
+:
+true
+}
+)
+;
+let
+element
+=
+document
+.
+createElement
+(
+'
+shadow
+-
+disabled
+'
+)
+;
+element
+.
+attachShadow
+(
+{
+mode
+:
+'
+open
+'
+}
+)
+;
+customElements
+.
+define
+(
+'
+shadow
+-
+disabled
+'
+ShadowDisabledElement
+)
+;
+customElements
+.
+upgrade
+(
+element
+)
+;
+assert_false
+(
+element
+instanceof
+ShadowDisabledElement
+'
+Upgrading
+should
+fail
+.
+'
+)
+;
+assert_true
+(
+error
+instanceof
+DOMException
+)
+;
+assert_equals
+(
+error
+.
+name
+'
+NotSupportedError
+'
+)
+;
+}
+'
+If
+definition
+\
+'
+s
+disable
+shadow
+is
+true
+and
+element
+\
+'
+s
+shadow
+root
+is
+'
++
+'
+non
+-
+null
+then
+throw
+a
+"
+NotSupportedError
+"
+DOMException
+.
+'
+)
+;
 <
 /
 script