An open-source operating system that controls the way a smart mobile device (a smartphone or tablet) works. it was created by google and is used by smartphone companies around the world.

Chrome OS is an open source OS developed by Google.

Css3 is the latest evolution of the cascading style sheets language and aims at extending css2.1. it brings a lot of new features and additions, like rounded corners, shadows, gradients, transitions or animations, as well as new layouts like multi-columns, flexible box or grid layouts.credits to medium for making this answer credits to google for copying this answercredits to me for putting this answer on your question