Allow webauthors to customize what controls are shown for HTMLMediaElement #2293
Description
The full explainer is here: https://docs.google.com/document/d/1dVPuL8UznIyhYn1KCnaMT7GRJFvDerSgqaUQhSiiY3Y/edit#heading=h.lqqvomsdg9jx
TL;DR allow websites do something like:
<video controls="nofullscreen nodownload"></video>var v = document.querySelector("video");
v.controls; // true
v.controlsList; // "nofullscreen nodownload"
v.controlsList.add("noremoteplayback");
v.controlsList; // "nofullscreen nodownload noremoteplayback"CC @jernoble @foolip @mounirlamouri
I'm happy to prepare a PR.