The WebGLRenderingContext.enable() method of the WebGL API enables specific WebGL capabilities for this context.

cap

A GLenum specifying which WebGL capability to enable. Possible values:

Constant	Description
gl.BLEND	Activates blending of the computed fragment color values. See WebGLRenderingContext.blendFunc().
gl.CULL_FACE	Activates culling of polygons. See WebGLRenderingContext.cullFace().
gl.DEPTH_TEST	Activates depth comparisons and updates to the depth buffer. See WebGLRenderingContext.depthFunc().
gl.DITHER	Activates dithering of color components before they get written to the color buffer.
gl.POLYGON_OFFSET_FILL	Activates adding an offset to depth values of polygon's fragments. See WebGLRenderingContext.polygonOffset().
gl.SAMPLE_ALPHA_TO_COVERAGE	Activates the computation of a temporary coverage value determined by the alpha value.
gl.SAMPLE_COVERAGE	Activates ANDing the fragment's coverage with the temporary coverage value. See WebGLRenderingContext.sampleCoverage().
gl.SCISSOR_TEST	Activates the scissor test that discards fragments that are outside of the scissor rectangle. See WebGLRenderingContext.scissor().
gl.STENCIL_TEST	Activates stencil testing and updates to the stencil buffer. See WebGLRenderingContext.stencilFunc().

When using a WebGL 2 context, the following values are available additionally:

Constant	Description
gl.RASTERIZER_DISCARD	Primitives are discarded immediately before the rasterization stage, but after the optional transform feedback stage. gl.clear() commands are ignored.

None (undefined).

gl.enable(gl.DITHER);

To check if a capability is enabled, use the WebGLRenderingContext.isEnabled() method:

gl.isEnabled(gl.DITHER);
// true

• WebGLRenderingContext.disable()
• WebGLRenderingContext.isEnabled()