Minimal testcase:
<!DOCTYPE html>
<canvas id="canvas"></canvas>
<script>
canvas.getContext("webgl");
</script>
System: Linux
Version: Version: Servo 0.0.3-079356795
Command: ./servo/servo --exit
Contexts must be destroyed explicitly with `destroy_context`! (thread WebGL, at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/surfman-0.11.0/src/platform/generic/egl/context.rs:69)