I'm a bit irked at the specific way the article keeps on bringing up unstandardized and clunky-as-hell looking features (I never knew about IE's behavior attribute; that looks scary) that were only ever implemented in IE as if IE was being unfairly judged. It's neat to see IE did those things, but the article glosses over that web features are good when they're cross-platform, standardized, and mesh well with other/future features. It's easy to just add features if you're IE and not worried about those things. It's telling that the article links to a demo for one of the old features and mentions you need a VM with some specific old IE for the demo to work. One way standardized features are better is that they tend to stay working in future browsers.