Obsolete HTML features
If you have been writing HTML for a few years, you might be surprised to learn there are parts of HTML that are now considered “obsolete.” It’s important to be aware that there are two camps of obsolete features in HTML; conforming and non-conforming. Conforming features will still work, but will generate warnings in validators. Realistically, avoid them if you can, but they aren’t going to make the sky fall down if you do use them. Non-conforming features may still render in certain browsers but they may not. It’s certainly not guaranteed.
In terms of obsolete and non-conforming features, there is quite a raft. I’ll confess that many I have never used. Some I’ve never even seen! It’s possible you may experience a similar reaction. However, if you’re curious, you can find the full list of obsolete and non-conforming features at https://html.spec.whatwg.org/multipage/obsolete.html. Notable obsolete...
