No emulation for vertex attrib 0 arrays. Always have vertex attrib 0 array enabled. In desktop OpenGL on some platforms (for example macOS), nothing gets drawn if vertex
attrib 0 is not array-enabled. You can use bindAttribLocation() to force a vertex attribute to use location 0, and use enableVertexAttribArray() to make it array-enabled.
No special error detection for binding attributes to overlapping locations (i.e. attribute aliasing) when linking a shader program.
The drawArrays and drawElements calls don't check for the validity of the enabled attributes or the buffers they point to.
Enabling the stencil context attribute also forces the depth attribute to be enabled.
Disabling alpha context attribute does not work on some platforms.
Trying to set canvas size to MAX_VIEWPORT_DIMS may result in OUT_OF_MEMORY on some graphics cards.
The following extra methods exist for contexts: objectNameChanged, nameChanged, canvasChanged, drawingBufferWidthChanged, and drawingBufferHeightChanged.
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