We did have basic error detection and reporting. For example if it failed to get WebGL in a normal HTML canvas, it would show a "WebGL not supported" error mess

We did have basic error detection and reporting. For example if it failed to get WebGL in a normal HTML canvas, it would show a "WebGL not supported" error message with some diagnostic details and some advice about what the user could do about it. The problem in this case is a gotcha where there are two ways to access the canvas API, one supporting WebGL, and the other not - a case we never anticipated, nor had happened with any previous browser.