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Fix canvas not being transparent by using Premultiplied alpha mode#3770

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timon-schelling wants to merge 1 commit intomasterfrom
fix-vello-background-web
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Fix canvas not being transparent by using Premultiplied alpha mode#3770
timon-schelling wants to merge 1 commit intomasterfrom
fix-vello-background-web

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@timon-schelling
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Important note the surface caps doesn't report PreMultiplied, wasn't able to find out why. But this seems to work for all browsers I was able to test.

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@timon-schelling
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@TrueDoctor Alternative would be setting a background color to the background color in the render node.

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