refframe-text-snap.yaml

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# Regression test for bug 2050692 (regressed by bug 2004666 patch 1).

# A text run inside an *offset-only* reference frame whose origin is at a

# fractional position. A stacking context with an offset but no transform

# synthesizes such a frame (the same path Gecko uses for an nsIFrame offset /

# translateZ(0)). After bug 2004666, device-mode text runs snapped their

# reference-frame origin against ROOT, so glyphs inside a fractional-origin frame

# picked up that fraction and landed ~1px off (the Slack channel-name clipping /

# sidebar text shift). An offset-only frame moves no content, so the only

# difference vs the reference is the presence of the fractional-origin reference

# frame; the reference draws the same glyphs at the same absolute position with no

# frame. A correct build renders them identically.

root:

  items:

    - type: stacking-context

      bounds: [100.5, 80, 300, 100]

      items:

        - type: text

          text: "XXXXXXXX"

          origin: [0, 30]

          size: 32

          color: [0, 0, 0, 1]

          font: "Ahem.ttf"