CasperSecurity
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<title>CodeMirror: Trailing Whitespace Demo</title>
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<link rel="stylesheet" href="/usr/share/javascript/codemirror/lib/codemirror.css">
<script src="/usr/share/javascript/codemirror/lib/codemirror.js"></script>
<script src="/usr/share/javascript/codemirror/addon/edit/trailingspace.js"></script>
<style>
.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
.cm-trailingspace {
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAACCAYAAAB/qH1jAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH3QUXCToH00Y1UgAAACFJREFUCNdjPMDBUc/AwNDAAAFMTAwMDA0OP34wQgX/AQBYgwYEx4f9lQAAAABJRU5ErkJggg==);
background-position: bottom left;
background-repeat: repeat-x;
}
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<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../html/logo.png"></a>
<ul>
<li><a href="../index.html">Home</a>
<li><a href="../html/manual.html">Manual</a>
<li><a href="https://github.com/codemirror/codemirror">Code</a>
</ul>
<ul>
<li><a class=active href="#">Trailing Whitespace</a>
</ul>
</div>
<article>
<h2>Trailing Whitespace Demo</h2>
<form><textarea id="code" name="code">This text
has some
trailing whitespace!</textarea></form>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true,
showTrailingSpace: true
});
</script>
<p>Uses
the <a href="../html/manual.html#addon_trailingspace">trailingspace</a>
addon to highlight trailing whitespace.</p>
</article>