WebGL is not a skill I'd put high on your list. Really knowing Javascript and learning how to be productive is far more important. WebGL IMO is still niche to

WebGL is not a skill I'd put high on your list. Really knowing Javascript and learning how to be productive is far more important. WebGL IMO is still niche to specific use cases and doesn't have a broad appeal, so the positions you are seeing are likely a microcosm of the overall job market. If you want to be employable, study and know javascript, know your front end stuff solid. Don't worry about knowing lots of different technologies, know a few key things really well, like Javascript, html and CSS, with those alone you have good employability. Each company will have their favorite framework and you'll work with it, so knowing how to come up to speed on Angular, or Ember or choose your flavor is more important then knowing them initially. And the core ability to do that is being solid in the basics. Good luck!