Yes, I see. That would be the wrong place for such code in any case.
HTML code which is to render an object in the body of a HTML document should be placed in the HTML Code (body) section.
Commonly you would create a placeholder rectangle on the page then add the code to the Web Properties Placeholder.
For example, in previous versions you could add a heading tag with text like this:
<H1>My heading text</H1>
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