Made IsContextLost automatically set the flag by checking with the emscripten WebGL wrapper + added a LOT of logging messages right before throwing ErrorCode_BadSequenceOfCalls exceptions + increased the http request timeouts from 60 to 600 sec (big datasets in some recent customer use cases) + added IsContext lost through the Viewport/Context layer (to make it reachable from external API) + the same for the underlying device context (for debug)

html, body {
  width: 100%;
  height: 100%;
  margin: 0px;
  border: 0;
  overflow: hidden; /*  Disable scrollbars */
  display: block;  /* No floating content on sides */
  background-color: black;
  color: white;
  font-family: Arial, Helvetica, sans-serif;
}

canvas {
  left:0px;
  top:0px;
}