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Sanitizer.GetSafeHtml and Sanitizer.GetSafeHtmlFragment retrun invalid html !
Suppose "<form><span>hello</span></form>" as input string, Sanitizer.GetSafeHtml returns "<html><head><form></head><body><span>hello</span></form></body></html>"
and Sanitizer.GetSafeHtmlFragment returns "<form><div><span>hello</span></form></div>", which both are invalid html!