ISSUE: the glyphs don't cover the entire em-cell, and the spec doesn't require visual alignment - text adjustments are based on advances
The purpose of this test is to validate the interaction of text-anchor and x/y glyph positioning.
Each row shows a different combination of x/y values: 1, more than characters, fewer than characters. Each column shows different anchor values: middle and end.
The blue markers show the various x/y absolute positions around which text chunks should be anchored. The glyphs are black squares of increasing sizes.
Run the test. No interaction required.
Rendered output must match the reference image for the test to pass.