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  <!doctype html>
  <html>
    <head>
      <title>CodeMirror 2: Breakpoint Demo</title>
      <link rel="stylesheet" href="../lib/codemirror.css">
      <script src="../lib/codemirror.js"></script>
      <link rel="stylesheet" href="../theme/default.css">
      <script src="../mode/javascript/javascript.js"></script>
      <link rel="stylesheet" href="../css/docs.css">
  
      <style type="text/css">
        .CodeMirror-gutter {
          width: 3em;
          background: white;
        }
        .CodeMirror {
          border: 1px solid #aaa;
        }
      </style>
    </head>
    <body>
      <h1>CodeMirror 2: Breakpoint demo</h1>
  
      <form><textarea id="code" name="code">
  CodeMirror.fromTextArea(document.getElementById("code"), {
    lineNumbers: true,
    onGutterClick: function(cm, n) {
      var info = cm.lineInfo(n);
      if (info.markerText)
        cm.clearMarker(n);
      else
        cm.setMarker(n, "<span style=\"color: #900\"></span> %N%");
    }
  });
  </textarea></form>
  
  <p>Click the line-number gutter to add or remove 'breakpoints'.</p>
  
      <script>
        CodeMirror.fromTextArea(document.getElementById("code"), {
          lineNumbers: true,
          onGutterClick: function(cm, n) {
            var info = cm.lineInfo(n);
            if (info.markerText)
              cm.clearMarker(n);
            else
              cm.setMarker(n, "<span style=\"color: #900\"></span> %N%");
          }
        });
      </script>
  
    </body>
  </html>