strange for some JS its still killing the code. For example
This code - works
<a href='//www.voipfone.co.uk/callmeback.php?code=8e52c3e26f38f90a", 350, 400, "", 20, 20)'><img src="https://www.voipfone.co.uk/images/call-me-back.jpg" width="120" height="60" border="0" align="absmiddle"></a>
Becomes (when HTML minification is active) - and fails
<a
href='JavaScript:openPopWin("http://www.voipfone.co.uk/callmeback.php?code=8e52c3e26f38f90a", 350, 400, "", 20, 20)'><img
src="https://www.voipfone.co.uk/images/call-me-back.jpg" width="120" height="60" border="0" align="absmiddle">
Looks like the space between the <a and the href= have been removed and seperated onto different lines