Blend mode supporting

[rexrainbow]

In this demo
The comments

            //  Canvas and WebGL:

            // NORMAL
            // ADD
            // MULTIPLY
            // SCREEN

            //  Canvas only:

            // OVERLAY
            // DARKEN
            // LIGHTEN
            // COLOR_DODGE
            // COLOR_BURN
            // HARD_LIGHT
            // SOFT_LIGHT
            // DIFFERENCE
            // EXCLUSION
            // HUE
            // SATURATION
            // COLOR
            // LUMINOSITY

Does not list some blend modes like 'SOURCE_IN', 'SOURCE_OUT', 'SOURCE_ATOP', ...
And these blend modes seems not working in this demo. Why?
Are 'SOURCE_IN', 'SOURCE_OUT', 'SOURCE_ATOP' different between these comments like 'OVERLAY', 'DARKEN', 'LIGHTEN', ... ?