Ask HN: Why can't the browser developers make the unstyled pages look better?

I was looking at this page https://www.jsoftware.com/help/jforc/contents.htm and it's not styled with any css. And it looks so old school. Why not the browser software creators get together and make the default look and feel much more modern? For example, if I'm typing something in the word or Google docs, the font, the typography, the default text color, the TOC, all look so much better out of the box. I hope the browser creators make the pages look better without any styles.