tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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div-orthogonal-auto-margin-ref.html (334B)

      1 <!DOCTYPE HTML>
      2 <title> Ensure element is centered by auto margin for orthogonal writing mode </title>
      3 <style>
      4  div {
      5    inset: 0;
      6    background-color: black;
      7    writing-mode: vertical-rl;
      8    margin: auto;
      9    position: absolute;
     10    block-size: 200px;
     11    inline-size: 100px;
     12    border: 5px solid red;
     13  }
     14 </style>
     15 <div></div>