Security hints

[thollander]

Is your feature request related to a problem? Please describe.

Svelte is really helpful for giving hints such as a11y (eg: A11y: '' is not a valid href attribute).
My point here would be to do kind of the same thing with basic security rules.

For instance, one of a security rule would be to not make a target=_blank on a link without the attributes rel="noreferrer noopener".

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mcmxcdev]

Not stale, also already has PR ready for it.

[Conduitry]

There is now a compile-time warning for this in 3.52.0.