title: css expression causes less error
body: <p>I'm using LESS and I have to write this code</p>
  
  <pre><code>*zoom: expression(
      this.runtimeStyle.zoom="1",
      this.insertBefore(
          document.createElement("div"),
          this.childNodes[0]
      ).className="before",
      this.appendChild(
          document.createElement("div")
      ).className="after"
  );
  </code></pre>
  
  <p>but it gives me Less syntax error.
  Could you help me?</p>