Related aside: to this day, we still cannot write <script src="/main.js"/>. We must use <script src="/main.js"></script>. All because of a multi-decade old description of a CDATA element. Sigh.
Web Components look to at least we can get some of those ideas back, instead of writing workarounds with HTML/CSS/JavaScript.
Yeah, I could close my tags and validate my code with the best of them back when XHTML was a thing--but that's no way to live. I'm glad WHATWG stepped in and literally saved the web from itself. OMG! XHTML 2 would have sucked so much!
why/how? because you'd have to close your tags and validate your code?
with fast internet raster images shouldn't be a big issue.
and all the browser does is send the window size and cursor position.