2018-06-15 UTC
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[chrisaldrich] Some of the poor legacy use is hard coded into WordPress core while other parts are just theme developers who don't know how to properly use or next microformats. Then there's also the issue of themers targeting semantic classes for CSS and JS which can cause things to break when using hooks/filters to inject mf2 programmatically, which is what the microformats plugin is trying to do.