mask: read one image per layer of the shorthand - #1173
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CSS Masking 1 sec. 8.7 spells mask as <mask-layer>#, so a comma in the shorthand separates layers and the image slot of one layer holds one image: the comma list belongs to the mask-image longhand. The layer reader reads the longhand, so it eats the comma and then fails on a second layer that does not open with an image. Chrome 153 reads every row here, and background's own shorthand already reads a single image per layer.
The layer reader read the mask-image longhand, whose comma list is the layer separator here, so it ate the comma and then failed on a layer that did not open with an image of its own: mask: none, 50% was dropped. Sec. 8.7 spells the shorthand <mask-layer>#, and background's own layer reader already takes a single image.
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mask: none, 50%andmask: url(a.png), 50%used to be dropped: the layer reader read themask-imagelonghand, whose comma list is the layer separator here, so it ate the comma and then failed on a layer that did not open with an image of its own.background's own layer reader already takes a single image.