2.1.23 [ISO32000-1] Section 11.6.7, Patterns and Transparency

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V0023:

The specification states:

 In the transparent imaging model, the graphics objects making up the pattern cell of a tiling pattern (see "Tiling Patterns") may include transparent objects and transparency groups. Transparent compositing may occur both within the pattern cell and between it and the backdrop wherever the pattern is painted.

Microsoft Edge:

Transparent patterns are rendered opaque.