[jerf]

We did have them 25 years ago.

https://learn.microsoft.com/en-us/previous-versions/windows/...

The documentation there may not make it clear, but you could do things like navigate from one page to the next, and fade in the new page, from a normal full page reload, with no intermediate flash of unstyled anything.

It was part of the attempt to lock the web into DirectX and even Microsoft themselves deprecated this a long time ago. But it definitely worked. I remember playing with it. IE4 though IE6-ish had a lot of weird stuff in it to try to drive lock in.

[k1t]

Bit more info here: https://www.htmlgoodies.com/javascript/dhtml-transitions/

Example to add a 1 second random fade-in:

  <META HTTP-EQUIV=”Site-Enter” content=”revealTrans(Duration=1.0,Transition=23)”>

[verticalscaler]

Time is a flat circle ;)