Why is diazo changing some HTML attributes even if "notheme" applied?

[yurj (Yuri)]

I'm looking for <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />, did you find any hint it is Diazo? If I do ?diazo.off=1, effectively disappear. Should we add this rule to rules.xml?

<drop content="/html/head/meta[@http-equiv='Content-Type']" />

I tested this but the meta tag is still there, maybe Diazo is adding it? Other findings in this post

Http-equiv meta tag

Hi! where the <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> came from in the Plone pages? We would like to drop it and use <meta charset="utf-8" />.