CSS for Media

The line height unit, the l h unit so you can set sizes in terms of multiples of line height. There's margin trim, which lets you trim the top and bottom margins let's say off of a block. You've got lazy loading i frames. I think that's actually really good. Even more than a lot of other things, especially because like YouTube uses i frames,. If you want to embed YouTube or something, it's using i frames. And there are some nice custom elements that have been built around this. But all of them are still managing like a lot of complexity and they're more complicated than they should be.