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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.italics()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var contentString = "Hello, world";
    var elem = document.createElement("i");
    elem.textContent = contentString;
    var styled = document.createElement("span");
    styled.textContent = contentString;
    styled.style.fontStyle = "italic";
    document.getElementById("out").textContent =
      elem.tagName + "\n" + elem.outerHTML + "\n" + styled.style.fontStyle;
  </script>
</body>
</html>

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String.italics() — createElement & CSS (Try It)