title: I want to hide text which is in <span> . but why it's not working?
body: <p>I want to hide text which is in <code>&lt;span&gt;</code> . but why it's not working?</p>
  
  <pre><code>.pdf {text-indent: -9999}
  
  &lt;p&gt;
     &lt;a href="reader_overview.pdf" title="Open in a new Window" target="_blank"&gt;&lt;img src="pdf.gif" alt="PDF" width="16" height="16" /&gt;
     &lt;span class="pdf"&gt;PDF 34KB, Opens in a new window&lt;/span&gt; &lt;/a&gt;
  &lt;/p&gt;
  </code></pre>