[css-backgrounds] Add test ensuring border-image is displayed with a transparent border-color #26350
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A transparent
border-color
should not prevent aborder-image
from being rendered, but this is the case in WebKit today. Gecko and Chromium do not exhibit this behavior.WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=217900
Spec: https://www.w3.org/TR/2017/CR-css-backgrounds-3-20171017/#border-images