3 ms·
From the slug of this page it seems since 2011? https://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#optional-tags https://www.w3.org/TR/2011/WD-html5-20110
by yoz-y 7y ago
From the slug of this page it seems since 2011? https://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#optional-tags https://www.w3.org/TR/2011/WD-html5-20110525/syntax.html#opt...
Note though that there are some conditions.