resize.html
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<!doctype html>
<html>
<head>
<title>CodeMirror 2: Autoresize 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/css/css.js"></script>
<link rel="stylesheet" href="../css/docs.css">
<style type="text/css">
.CodeMirror {
border: 1px solid #eee;
}
.CodeMirror-scroll {
height: auto;
overflow-y: hidden;
overflow-x: auto;
}
</style>
</head>
<body>
<h1>CodeMirror 2: Autoresize demo</h1>
<form><textarea id="code" name="code">
.CodeMirror-scroll {
height: auto;
overflow-y: hidden;
overflow-x: auto;
}</textarea></form>
<p>By setting a single CSS property, CodeMirror can be made to
automatically resize to fit the content. Use <code>max-height</code>
to prevent it from growing past a given point (on halfway modern
browsers).</p>
<script>
CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true
});
</script>
</body>
</html>