of the writing-mode of its DOM-tree parent.">
<style>
  .cb {
    block-size: 50px;
    inline-size: 40px;

    /* This margin & border are purely cosmetic and don't impact the sizing
     * calculations in this test: */
    margin: 5px;
    border: 2px solid black;

    /* This padding is relevant to 'stretch' sizing, since our padding-box
     * forms the containing block for the abspos child. Our padding-box
     * block-size 50 + 2*5 = 60px, and its inline-size is 40 + 2*3 = 46px */
    padding-block: 5