webgl

See KhronosGroup/glTF#1691 for implementation spec.

fitDataset() expects a Dataset that produces elements of a certain shape, with matching batch sizes etc., and throws errors (from standardizeDataIteratorOutput()) when the conditions are not met. These errors should be tested.

The test button section is getting a little crowded and will be more so when xtermjs/xterm.js#3850 is done. We should organize it into categories or something.

Basic idea:

• Lifecycle
  • Dispose terminal
• Performance
  • Load test
• Styles
  • Tes

Most items coming from questions on the community forum

• a proper multicategory bar example based on https://community.plotly.com/t/multicategory-axis-type-example/26392
• example of shape or annotation covering several subplots thanks to xref='paper'. Also the shapes and annotations tutorial should link to each other.
• orthographic projection example in 3d axes tutorial (or

The Custom Shaders 3D Tiles sandcastle example does not have an optimal initial view. This makes it harder to see what's going on a first glance, and harder to test when testing for a release.

Maybe we should default to the view used in the [feature picking example](https://sandcastle.cesium.com/?src=3D%20Tiles%20Feature%