All our proprietary pseudo-classes and pseudo-elements will have to use
the -moz- prefix when patch for bug 62843 [1] gets in.
Examples : :first-node becomes :-moz-first-node
:table-cell becomes :-moz-table-cell
The patch is fixing html.css, quirk.css and forms.css.
After this date, I'll also recommend that pseudo-elements use
the new notation introduced by Selectors Candidate Rec [2] with
a leading :: instead of a single :
[1] http://bugzilla.mozilla.org/show_bug.cgi?id=62843
[2] http://www.w3.org/TR/css3-selectors
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