You cannot know that anything it shows you was generated by executing the code and isn't merely a simulacrum of execution output. That includes images.
Yes, you can. In my experience, models do not tend to write their own HTML output. They tend to output something like Markdown, or a modified version of it, and they wouldn't be able to write their own HTML that the browser would parse as such.
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Maybe the only way to be sure is to have it generate (not stable diffuse) an image with the value in there.
You cannot know that anything it shows you was generated by executing the code and isn't merely a simulacrum of execution output. That includes images.
Yes, you can. In my experience, models do not tend to write their own HTML output. They tend to output something like Markdown, or a modified version of it, and they wouldn't be able to write their own HTML that the browser would parse as such.