As of bug 1432966, any HTML injected into chrome-privileged documents[1] is
automatically sanitized to remove any possibility of script execution. The
sanitization is whitelist-based, and only allows a limited set of HTML
elements and attributes. All scripts, XUL nodes, or privileged URLs will
automatically be removed. This change has been uplifted all the way to 58
release.
If you're thinking about writing new code that injects HTML strings into
chrome-privileged documents, please think again. Unless it's extremely simple,
it probably won't be compatible with these changes (and will also be rejected
by our default ESLint rules).
Existing HTML injection in chrome documents is being gradually removed. Once
that's done, the sanitization may be replaced with an outright prohibition.
-Kris
[1]: Using the usual HTML fragment creation methods such as `innerHTML`,
`outerHTML`, `insertAdjacentHTML`, and `createContextualFragment`. Not,
notably, when using document.write().
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