Prerequisites

Identify your User ID

Steps to reproduce

1. Run adb shell am start -a android.intent.action.VIEW -d fenix-nightly://make_default_browser\?uid=Your User ID on a Nightly Build.

Expected behavior

Open "Make Firefox the default browser on Android" Sumo page ❓ as implemeted in #5898

Actual behavior

Besides

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

Somehow we haven't written down exactly what the various events do.

We should take the opportunity to point people to DocLoad because that's what they will want 90% of the time.