.4 = 40px.
   - This makes the grid container's height 40px * 2 = 80px in this pass.

  The second pass:
   - With the grid container's height now became fixed at 80px, the available
     grid space is known.
   - Per https://drafts.csswg.org/css-grid-2/#algo-find-fr-size
     the hypothetical fr size is 80px * max(0.4 * 2 , 1.0) = 80px.
   - In this pass, each 0.4fr row track resolves to 80px * 0.4 = 32px in height.
-->

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
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