CodeMirror: Autoresize demo

.CodeMirror {
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.CodeMirror {
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  border: 1px solid #eee;
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  height: auto;
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}
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.CodeMirror-scroll {
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  overflow-y: hidden;
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  overflow-x: auto;
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}
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By setting a few CSS properties, and giving the viewportMargin a value of Infinity, CodeMirror can be made to automatically resize to fit its content.