CSS (Cascading Style Sheete) font-size property does not work properly in Internet Explorer (IE) if spcified in this way,
font-size: small or font-size: normal
In mozilla firefox it works fine.
Workaround:
Use em to specify the font size e.g.,
body {font-size: 0.75em;}
Refer this for more on font-size property in IE.
Button tag inside anchor not working in IE
HTML button tag might not work as expected when put inside anchor tags.
<a href="http://www.google.com"><button type="button">Click Me to go to Google</button></a>
I works well in Mozilla Firefox but in Internet Explorer (IE) nothing happens on clicking it.
Workaround:
Put some javascript event inside onclick event handler. Redirect (or open a new window) in javascript to required URL.
<a href="http://www.google.com"><button type="button" onclick="window.open('http://www.google.com')">Click Me to go to Google</button></a>
It should work in Mozilla Firefox as well as Internet Explorer (IE).
For more info, refer button tag inside anchor not working