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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Test Page</title>
<style>
  body {
    font-family: sans-serif;
  }
</style>
</head>
<body>
  <p>Text that will turn green</p>
  <button id="theButton">Toggle Green Text via Styles</button>
</body>
</html>
 
(function() {
  var css = "body { color: green; }";
  
  document.getElementById("theButton").onclick = toggleStyle;
  
  function toggleStyle() {
    var style = document.getElementById("styleOne");
    if (style) {
      // Remove it
      style.parentNode.removeChild(style);
    }
    else {
      // Add it
      style = document.createElement('style');
      style.id = "styleOne";
      if (style.styleSheet) {
          style.styleSheet.cssText = css;
      }
      else {
          style.appendChild(document.createTextNode(css));
      }
      document.body.appendChild(style);
    }
  }
  
})();
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