A #hashlink could be an interesting #idea to ensure that #content #linked to has not changed over time: https://datatracker.ietf.org/doc/html/dr.. I still think it may be useful as a #link #element in #html to replace all of those #hashsum 's.
Interesting #idea by #apple #webkit #developers for a 3D #html #element to display 3D objects: https://github.com/WebKit/explainers/tre.. I think there could really be a need for something, but I fear that it could end up being a #gameengine ... I think the #proposal needs work, such as #camera definitions, etc. Otherwise the viewing experience will not be the same across #browsers - or even similar setups.