> portals can be pre-loaded while the user scrolls through a page Let's be real here. This can already be done though "prefetch" and "preload" [0]. This is just Google introducing more pointless tech that will make webpages clunkier for no good reason. Honestly, I can't think of a single purpose this serves that isn't already fulfilled by existing web tech. [0]: https://stackoverflow.com/questions/49491193/how-can-i-…
The spec goes into detail of why existing tech (iframes) aren't enough: https://github.com/WICG/portals/blob/master/explainer.md#faq... https://github.com/WICG/portals/blob/master/explainer.md#alt...
Heh, "we considered this but it's hard to do in Chrome".
But they don't give a shit if is hard to do in Gecko, of course.