I’ve been trying to adapt the YouTube iframe feature to display HTML pages instead. It seems to work fine in most browses except Firefox (which seems to encounter a few Playcanvas bugs and performance issues, though it seems to be improving gradually). An artifact occurs at certain angles, covering part of the image with black. A YouTube embed or direct MP4 URL works alright. It’s just HTML that runs into trouble.
Displaying HTML page in Firefox:
Displaying embedded YouTube video in Firefox: