px;
    padding-inline: 3px;

    /* We make each containing block an inline-level box, so we can display
     * subtests in multiple rows, for easier visualization: */
    display: inline-block;
    vertical-align: top;
    position: relative;
  }

  .test {
    /* To make sizes predictable, we start out at the edge of our
     * containing block: */
    inset-inline-start: 0;
    inset-block-start: 0;

    position: absolute;
    /* We have 2+3 = 5px of margin in the block axis. This means the stretched
 