Relevant spec sections:

https://drafts.csswg.org/selectors-4/#the-dir-pseudo
https://html.spec.whatwg.org/multipage/semantics-other.html#selector-ltr

The interesting cases to test are from the definition of "directionality" in HTML:
https://html.spec.whatwg.org/multipage/dom.html#the-directionality

• element with dir="ltr" matches :dir(ltr)
• root element without dir attr

Important info

• URL to affected spec: https://w3c.github.io/mediacapture-main/getusermedia.html
• ReSpec version: 25.14.0
• I did a "hard refresh", but it's still busted.

Description of problem

What happened (e.g., it crashed)?:
The markup <a href="#mediadevices></a> which allows to create a human readable link to the said section creates invalid markup, because the he

A DocumentFragment object exposes its innerHTML property, just like other Element objects do. This isn't a feature of the native DOMDocument, so it has to be exposed to IDEs using PHPDoc. Currently, accessing the innerHTML property works fine, but IDEs do not recognise the property.