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CSS supports blend modes, in which a series of layers are merged together according to the given operation or set of operations. Support for blend modes landed on Cairo, which exposes all the commons and also the exquisites blend modes available. Adding support for blend modes, then, is just a matter of using the available Cairo operations. This patch adds the background-blend-mode CSS enum property, and adapts the background rendering code to blend the backgrounds using the available blend modes when they're set. https://bugzilla.gnome.org/show_bug.cgi?id=768305
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