User blog comment:Ohmyn0/Making your wiki HTML5 compliant/@comment-1292629-20120707211635/@comment-118323-20120709183657

Because we have hundreds of thousands of wikis to upgrade, we can't easily offer a complete list for everyone. Best is just to check Special:Version for your wikis.

No need to wait for the 1.19 upgrade before double checking your HTML if you use a lot of styling.