loda-rust/rust_project/loda-rust-web/web/codemirror/demo/trailingspace.html

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<title>CodeMirror: Trailing Whitespace Demo</title>
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<link rel="stylesheet" href="../lib/codemirror.css">
<script src="../lib/codemirror.js"></script>
<script src="../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==);
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  <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>

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    <li><a href="../index.html">Home</a>
    <li><a href="../doc/manual.html">Manual</a>
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  <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="../doc/manual.html#addon_trailingspace">trailingspace</a>
addon to highlight trailing whitespace.</p>

  </article>