Focusable: Fix handling of visibility: collapse
#1843
Merged
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"collapse" is similar to "hidden", with a slight difference in the case of
tr/tbody/td/colgroup
elements.See https://www.w3.org/TR/CSS22/visufx.html#visibility
See https://www.w3.org/TR/CSS22/tables.html#dynamic-effects
See https://developer.mozilla.org/en-US/docs/Web/CSS/visibility#Table_example
"visibility: collapse" elements are always not focusable, though.
Commit d302596 introduced this regression by testing with
!== "hidden"
instead of=== "visible"
.