[csswg-drafts] Security/Privacy considerations of css-contain misuse?

svgeesus has just created a new issue for https://github.com/w3c/csswg-drafts:

== Security/Privacy considerations of css-contain misuse? ==
>From Ralph Swick, on the `css-contain`  CR transition call: 
>        Security considerations should include something about risks and counter-measures if a bad actor misuses these new features; e.g. to alter (and misrepresent) what is rendered to the user.

>    Would it be appropriate to have some test cases that misuse the features and test what the implementation does in those situations?



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