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When the 'none' value was applied to a heading element the content could still be selected.
According to the W3C, the <i>"user agent's default style sheet may override this value. For example, user agents typically do not allow selection of the contents of a BUTTON element.</i> [http://www.w3.org/TR/1999/WD-css3-userint-19990916#user-select]
== Specification Conformance ==
