div-orthogonal-block-size-ref.html

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<!DOCTYPE HTML>

<title> Ensure block size is same as height of inner div for orthogonal writing mode </title>

<style>

  div {

    inset: 0;

    background-color: black;

    writing-mode: vertical-rl;

    position: absolute;

    block-size: 200px;

    inline-size: 100px;

    border: 5px solid red;

</style>

<div></div>