Alpha blending experimentation.

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Animate
Source blending factor
(Percentage of the object's color to render.)    		 Destination blending factor
(Percentage of color already in the color buffer)
gl.ZERO
gl.ONE
gl.SRC_COLOR
gl.ONE_MINUS_SRC_COLOR
gl.DST_COLOR
gl.ONE_MINUS_DST_COLOR
gl.SRC_ALPHA
gl.ONE_MINUS_SRC_ALPHA
gl.DST_ALPHA
gl.ONE_MINUS_DST_ALPHA
gl.CONSTANT_COLOR
gl.ONE_MINUS_CONSTANT_COLOR
gl.CONSTANT_ALPHA
gl.ONE_MINUS_CONSTANT_ALPHA
gl.SRC_ALPHA_SATURATE 		gl.ZERO
gl.ONE
gl.SRC_COLOR
gl.ONE_MINUS_SRC_COLOR
gl.DST_COLOR
gl.ONE_MINUS_DST_COLOR
gl.SRC_ALPHA
gl.ONE_MINUS_SRC_ALPHA
gl.DST_ALPHA
gl.ONE_MINUS_DST_ALPHA
gl.CONSTANT_COLOR
gl.ONE_MINUS_CONSTANT_COLOR
gl.CONSTANT_ALPHA
gl.ONE_MINUS_CONSTANT_ALPHA
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);