[Gecko Bug 1796268] Add a test for IntersectionObserver root with clip and padding. #42599
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This is a spec issue. See the test. The element is completely visible,
so the intersection ratio should be 1.
Spec issue: w3c/IntersectionObserver#504
Spec PR: w3c/IntersectionObserver#517
Differential Revision: https://phabricator.services.mozilla.com/D191277
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1796268
gecko-commit: 75132d2a2bac7bc70e1dc808f197967750004238
gecko-reviewers: smaug