text-indent-1b.html

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<!DOCTYPE html>

<html class="reftest-wait">

  <iframe sandbox

          style="width: 200px"

          srcdoc="<canvas style='text-indent: 50vw; display: block'>Text</canvas>"></iframe>

  <script>

    onload = function() {

      var i = document.querySelector("iframe");

      window.w = i.offsetWidth;

      i.style.width = "400px";

      document.documentElement.className = "";

  </script>

</html>