inset-fake-border-snap.yaml

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---

# Bug 2052033: an inset, zero-blur box-shadow used as a "fake border" whose

# element sits at a fractional device position. The ring's outer edge is the

# (snapped) element rect; its inner edge is a ClipOut derived by insetting the

# element by the spread. That inner ClipOut must NOT be snapped to the device

# grid on its own -- if it is, each side rounds independently and the sides

# thicken at different times as the spread animates.

# This is the != companion of inset-fake-border-snap-notref.yaml, which builds

# the same ring with an ordinary (snapped) inner rect. With the fix the inner

# edge here stays fractional, so the two renders differ; without the fix the

# inner edge is snapped identically to the notref and the renders match.

root:

  items:

    - type: stacking-context

      bounds: [0, 0, 250, 250]

      items:

        - type: rect

          bounds: [0, 0, 250, 250]

          color: [255, 255, 255]

        - type: box-shadow

          bounds: [20.4, 20.3, 200.5, 200.5]

          color: [0, 0, 0, 1]

          clip-mode: inset

          offset: [0, 0]

          blur-radius: 0

          spread-radius: 1.3