colon in HTML

CSS (green background if selector was applied):

[a\:foo]

@namespace aria ...; [aria|foo]

.getAttribute('a:foo')

Script didn't run

.getAttributeNS('...', 'foo')

Script didn't run

a:foo='bar'

Script didn't run

setAttribute('a:foo', 'bar')

Script didn't run

setAttributeNS('...', 'a:foo', 'bar')

Script didn't run