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This adds a
checkVisibility
polyfill which can be useful to check if an element isn't visible.This method is quite new, Chrome 105+ and Firefox 106+ support it, and WebKit just merged their implementation 2 days ago (WebKit/WebKit#19210) so it'll likely land in Safari.
We want to use it in primer/view_components#2292 so figured the polyfill would be best placed here.