> Currently, `attr()` works only in the `content` property which is limited to `::before` and `::after` pseudoelements. It's not limited to `::before/::after`. The [spec](https://drafts.csswg.org/css-content-3/#content-property) for the `content` property says: > Applies to: all elements, tree-abiding pseudo-elements, and page margin boxes It's not implemented for (non-pseudo) elements yet in any UAs as far as I know, but at least Gecko supports it on `::marker` (and we intend to support it on all elements at some point). I don't think that changes the security aspects though, since it would still be considered _generated content_; same as for pseudos. -- GitHub Notification of comment by MatsPalmgren Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5092#issuecomment-631386624 using your GitHub accountReceived on Wednesday, 20 May 2020 10:22:32 UTC
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