I'm sorry if this has been asked before.
Some ES6/7 standards are implemented in Firefox beta versions alone and not in Chrome, and vice versa. Can anyone please list which browsers support what? Is there any single browser which implemented most of those standards.
For e.g.: I'm not able to use Object.observe in Firefox. It is available in Chrome beta v36.
Please see: Do not mark duplicate for object.observe. I'm not interested in Object.observe There are other standards as well. Please specify others compatibility too.