XPath issue with IFrames and Chrome

<html>
<!--
Looking for an xpath is not working properly when using IFrame. Save this file as xpath-test.html on a webserver and open it.

Then try the following xpath: (//a[@class="testx"])[1]

You wil get at least two results
 -->
<body>
<a class="testx" href="xpath-test.html">test</a>
<a class="testx" href="xpath-test.html">test</a>

<iframe src="xpath-test.html">
</iframe>
</body>
</html>