I know Iced is not trying to match Qt in any way shape or form, but a simple HTML renderer would be incredibly appreciated. Not a live web connection, the display of a reduced and therefore more feasible subset of HTML. Qt only supports a very small amount of HTML tags, and that is all most users looking for a non-browser HTML renderer need. For myself, my primary motivation is Github Flavored Markdown support. It is not a light task but I would love if it would be on the roadmap, however distantly, especially since it would not come with the burdens that the promise of full HTML support carry.
You might be interested in embedding https://servo.org/.
For Markdown, there are people working on that. Check the showcase channel in Discord.