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Thanks@yuvipanda

I expanded following the discussion at#14919 to dynamically styled the links in the frame when it is untrusted. Let me know what do you think?

cc@krassowski

Kicking CI following bot commit

I changed the CSS selector (and add the tagsarea andform) and I change slightly the style of the warning to make it look like a banner:

The latest commit

• add the case offormtarget
• rephrase the warning toAction disabled as the file is untrusted. as button can become disabled; good English speaker feel free to suggest a better wording.

I wonder if "not trusted" would be more consistent. Also, we could set a non-serif font on the banner but it's all minor details.

CI failure is not related - thanks@krassowski for the review

@meeseeksdev please backport to 4.0.x