setPreview strips style tags: any way to include CSS style tags for preview?

[prurph]

I'm able to include a script tag in the raw HTML string provided to widget in order to easily provide styles for the generated widget, but this doesn't work for setPreview. Using the dev tools suggests it is being stripped out.

Is it possible to include CSS in a style tag for the preview? This is very useful for applying sane styles to generated markdown, for example from github-markdown-css.