2.1.21 [ISO32000-1] Section 11.3.5, Blend Mode

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V0021:

The specification states:

 In principle, any function of the backdrop and source colours that yields another colour, Cr, for the result may be used as a blend function B (Cb, Cs), in the compositing formula to customize the blending operation. PDF defines a standard set of named blend functions, or blend modes, listed in Tables 136 and 137.

Microsoft Edge:

For all blend modes other than Normal, the shape parameter is ignored.