Bug 1949819 [wpt PR 50871] - add disconnected tests for command events, a=testonly

Automatic update from web-platform-tests
Add disconnected tests for command events

For whatwg/html#11049.
--

wpt-commits: b0c8f027e0657bc8c8d78156edd71400a4630b40
wpt-pr: 50871

UltraBlame original commit: dd6bd09b1b756ee164a9d1895508bf08d2e92728

Author: marco-c

testing/web-platform/tests/html/semantics/the-button-element/command-and-commandfor/on-dialog-disconnect.html

@@ -0,0 +1,390 @@
+<
+!
+doctype
+html
+>
+<
+meta
+charset
+=
+"
+utf
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+8
+"
+/
+>
+<
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+=
+"
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+=
+"
+Keith
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+=
+"
+mailto
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+wpt
+keithcirkel
+.
+co
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+uk
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+/
+>
+<
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+=
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+=
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+=
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+https
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+=
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+=
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+testdriver
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+=
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+=
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+=
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+<
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+const
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+=
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+(
+'
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+)
+;
+promise_test
+(
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+(
+t
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+{
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+"
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+)
+;
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+(
+)
+=
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+=
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+)
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+}
+)
+;
+await
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+assert_true
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+"
+)
+;
+assert_false
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+invokee
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+isConnected
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+dialog
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+"
+)
+;
+assert_false
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+;
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+)
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+)
+;
+}
+invoking
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+event
+does
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+raise
+an
+error
+)
+;
+<
+/
+script
+>