HTML

To demonstrate the future-proof nature of HTML, you can open the first-ever web browser, which was written by Sir Uncle Timbo himself in 1991. Open a web page by choosing Document > Open from Full Document Reference, and type a URL in the box. A well-structured HTML document will still render. It won’t have any styles (CSS 1 wasn’t specified until 1996, and it was 2000 until IE5 for Mac shipped with an almost full implementation) and some of the more exotic punctuation marks or characters might be replaced by their character codes, but you can still read the content. And, for the vast majority of sites, the content is what users come for.