tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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insertion-in-first-line-12.html (325B)

      1 <!DOCTYPE html>
      2 <style>
      3  div { color: red; }
      4  div::first-line { color: green }
      5  #y { display: inline-block; }
      6 </style>
      7 <div id="x"><span id="y">green</span></div>
      8 <script>
      9  x.offsetWidth;
     10  var span = document.createElement('span');
     11  span.textContent = 'This should be ';
     12  y.insertBefore(span, y.firstChild);
     13 </script>