The large, small, and dynamic viewport units
New CSS units that account for mobile viewports with dynamic toolbars.
Newly interoperable
Features that have recently become supported in all three engines.
CSS Animated Grid Layouts
In CSS Grid, the grid-template-columns and grid-template-rows properties allow you to define line names and track sizing of grid columns and rows, respectively. Supporting interpolation for these properties allows grid layouts to smoothly transition between states, instead of snapping at the halfway point of an animation or transition.
Is it :modal?
This handy CSS pseudo-selector gives you a way to select elements that are modal.
Finer grained control over CSS transforms with individual transform properties
Transform elements with the translate, rotate, and scale properties
TransformStream is now supported cross-browser
Now that transform streams are supported in Chrome, Safari, and Firefox, they're finally ready for prime time!