title: How to determine number of active WebGL contexts?
body: <p>Browsers impose limits on the number of active WebGL contexts.  Exceed the limit and the <a href="https://stackoverflow.com/questions/59140439/allowing-more-webgl-contexts">browser will start to dump older contexts</a>.  My understanding is that there are limits per domain as well as an overall max.</p>
  
  <p>Two questions:</p>
  
  <ol>
  <li>Is there a way to determine how close you are to the limits, i.e., how many active WebGL contexts there are and how many available?</li>
  <li>I've found scraps of info here and there, but haven't been able to nail down exactly what the limits are for each browser, both per-domain and max.  What are the limits for Chrome, Firefox, Safari, Edge and IE 11?</li>
  </ol>