Pasting HTML into editor

[yoshie902a]

When I click the source button and paste new HTML into it, it gets all screwed up. It gets removed, is missing specific parts. What causes this? What is the way to fix it?

[joshmn]

Are any of the HTML elements you are pasting not defined by the editor? That would be my guess.

[BananaNeil]

I am having this issue as well.

When I paste <div data-paperform-id="cj3sohoc"></div> into the editor, it just says <div></div>.

When I paste a script tag, it doesn't show up at all.