Adding on to this, while this article is fast approaching 20 years old, it gets into the quagmire that is web standards and how ~10 (now ~30) years of untrained amateurs (and/or professionals) doing their own interpretations of what the web standards mean–plus another decade or so before that in which there were no standards–has led to a situation of browsers needing to gracefully handle millions of contradictory instructions coming from different authors’ web sites.
Adding on to this, while this article is fast approaching 20 years old, it gets into the quagmire that is web standards and how ~10 (now ~30) years of untrained amateurs (and/or professionals) doing their own interpretations of what the web standards mean–plus another decade or so before that in which there were no standards–has led to a situation of browsers needing to gracefully handle millions of contradictory instructions coming from different authors’ web sites.
Here’s a bonus: the W3C standards page. Try scrolling down it.