Fix visible
to work with elements in the Shadow DOM
#72
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As a follow-up to #63 and #64, this applies the same shadow DOM fix for
visible
.I have modified the check for both
displayed
andvisible
to restore backwards-compatibility: on older browsers that don't support.getRootNode
, it'll fall back to the older check ofdocument.body.contains(el)
.I also modified the test from #64, which was returning false positives (passing both before and after the fix). The new test successfully passes with the fixes, and fails without the fixes.