Content Studio alters HTML pasted in the HTML-editor


Enonic version: 7.0

When we paste HTML (a large table) inn the HTML-editor i removes class-attributes and ads style.
The HTML pasted is valid and works fine if I insert it with Datatoolbox.
This must be a bug? Why would you alter the HTML pasted as long as it´s valid?

Also the HTML-editor is not showing if the HTMLArea is inside an item-set.