stringbuffer-USVString.html

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<!doctype html>

<script>

  var div = document.createElement("div");

  // Need a long-enough string that when we get it from the DOM it will not get

  // inlined and will be an external stringbuffer string.

  var str = "http://" + (new Array(200).join("a"));

  div.setAttribute("x", str);

  str = div.getAttribute("x");

  // Now pass it as a USVString

  new URL(str);

</script>