The CSS rules for `wbr/br` uses a `display-outside` property which no longer exist.

[MatsPalmgren]

https://html.spec.whatwg.org/multipage/rendering.html#br-wbr-content

br { display-outside:​ newline; } /* this also has bidi implications */ nobr { white-space:​ nowrap; } wbr { display-outside:​ break-opportunity; } /* this also has bidi implications */

The rules for wbr/br uses a display-outside property which no longer exist in the relevant CSS spec. (And newline and break-opportunity aren't valid display values either.)

[zcorpan]

Also see #2291

[domenic]

Seems like just a dupe of that, probably should roll them together?

My attempt at #2298 to fix this got stalled; if someone wanted to take that over that would be great.

[zcorpan]

Yeah, closing.