No, there is a specification for HTML5, and it does exactly what I said it does. Granted, most "HTML5" is a mix of HTML 4 and HTML5 (sometimes even a little XHT

No, there is a specification for HTML5, and it does exactly what I said it does. Granted, most "HTML5" is a mix of HTML 4 and HTML5 (sometimes even a little XHTML) but these are not strict validated sites. Here, try running a few websites through https://validator.w3.org/ https://validator.w3.org/ and see what pops up. You'd be surprised. For example, https://news.ycombinator.com https://news.ycombinator.com is extremely bad HTML5, and if you look at the report on it, https://html5.validator.nu/?doc=https%3A%2F%2Fnews.ycombinator.com&showimagereport=yes&showsource=yes https://html5.validator.nu/?doc=https%3A%2F%2Fnews.ycombinat... you can see a bunch of "Use CSS Instead" suggestions. This is the separation of style from semantics that HTML5 was made to reinforce.