[Gecko Bug 1898833] Support oncontentvisibilityautostatechange event handler #47216
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Spec PR: whatwg/html#10364
Differential Revision: https://phabricator.services.mozilla.com/D217187
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1898833
gecko-commit: e2635b8bf747fe8542ea4442db5aca85bd94eb1b
gecko-reviewers: emilio, smaug