@mjgardner@social.sdf.org There's also HTML 4.01 for those who don't want to deal with XML, as well as CSS 2.1 and ECMAScript 5. Though for JS in browsers I would probably go for ES6 or ES2017 at least to support pretty much all use-cases out there. But if you're a website developer then opt for the older ES5 instead.
The first step to a truly #openweb is to bring back caring about backwards compatibility.
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