HTML heading problem in WD 11

[steve.ledger]

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>