The ANGLE_instanced_arrays extension is part of the WebGL API
allows to draw the same object, or groups of similar objects
times, if they share the same vertex data, primitive count and

web.gl-ext interfaces.

The EXT_disjoint_timer_query extension is part of the WebGL API
provides a way to measure the duration of a set of GL commands,
stalling the rendering pipeline.

The OES_vertex_array_object extension is part of the WebGL API
provides vertex array objects (VAOs) which encapsulate vertex
states. These objects keep pointers to vertex data and provide
for different sets of vertex data.

The WEBGL_compressed_texture_astc extension is part of the WebGL
and exposes Adaptive Scalable Texture Compression (ASTC) compressed
formats to WebGL.

The WEBGL_debug_shaders extension is part of the WebGL API and
a method to debug shaders from privileged contexts.

The WEBGL_draw_buffers extension is part of the WebGL API and
a fragment shader to write to several textures, which is useful
deferred shading, for example.

The WEBGL_lose_context extension is part of the WebGL API and
functions to simulate losing and restoring a `web.gl.WebGLRenderingContext`.