Bug 1907849: part 3) Enrich documentation of <Element-setAttribute-re…

…spects-Elements-node-documents-globals-CSP.html>. r=smaug

Before it was hard to understand.

Differential Revision: https://phabricator.services.mozilla.com/D231919

UltraBlame original commit: 882367ece1887f223f49219aa381aa5df880f9bb

testing/web-platform/tests/trusted-types/Element-setAttribute-respects-Elements-node-documents-globals-CSP.html

@@ -542,13 +542,94 @@
 '
 s
 global
-belongs
+should
+belong
 to
+/
+/
 a
 TT
 -
 realm
 .
+/
+/
+Hence
+below
+calls
+to
+setAttributeNode
+and
+setAttributeNS
+/
+/
+should
+throw
+because
+/
+/
+<
+https
+:
+/
+/
+github
+.
+com
+/
+whatwg
+/
+dom
+/
+pull
+/
+1268
+/
+files
+#
+diff
+-
+30f698d9b4650514daf7a04de5e44eebf8feff1a30e0505f8eeaf06703b2777dR6587
+>
+/
+/
+invokes
+<
+https
+:
+/
+/
+www
+.
+w3
+.
+org
+/
+TR
+/
+trusted
+-
+types
+/
+#
+validate
+-
+attribute
+-
+mutation
+>
+.
+/
+/
+The
+latter
+should
+throw
+when
+executing
+step
+5
+.
 assert_throws_js
 (
 sourceFrame