Bug 1672543 [wpt PR 26201] - Check that contain strict and content co…

…mpute to the longhands, a=testonly

Automatic update from web-platform-tests
Check that contain strict and content compute to the longhands (#26201)

They serialize back to the shorthand thanks to the shortest
serialization principle
--

wpt-commits: 98c4e2d52402156bfafcd1466985b5336f6c7240
wpt-pr: 26201

testing/web-platform/tests/css/css-contain/parsing/contain-computed.html

@@ -24,6 +24,8 @@
 test_computed_value("contain", "style paint");
 test_computed_value("contain", "layout style paint");
 test_computed_value("contain", "size layout style paint");
+test_computed_value("contain", "size layout paint", "strict");
+test_computed_value("contain", "layout paint", "content");
 </script>
 </body>
 </html>