What are the limitations of Unity 5.2 WebGL platform.?

Hi I am a unity developer and was working with unity 4.3 for an year. Now planning to build an multi player gaming application for the web. And planning to use unity 5.2 free version (since I dont know if it is really necessary to purchase a licensed one).

I heard that unity is stopping support for web player and webGL is the replacement for that.

Since I am new to the web platform, please advice me is it a good idea to start with WebGL, because I heard WebGL has some limitations.

Can you please help me to decide considering the limitations of WebGL. And is it necessary to purchase a pro license to do this.

I will be needing to use medium graphic assets and networking in my game.