To turn off autocompletion in HTML I use:
<input type="text" name="foo" autocomplete="off" />
But this forces me to specify autocomplete="off" in every input field of my application. Is it possible to define autocomplete="off" in a CSS style?
You can just apply it to the form tag.
Using CSS you cannot achieve it. You can use client side script for example using Jquery
$('input').attr('autocomplete','off');
If you are not using Jquery or scripting language then you have to stick to HTML only.
As TeT Psy said you can apply it in form tag like
<form id="Form" runat="server" autocomplete="off">
                        you can disable all the autocompletes using form 
<form id="Form1" runat="server" autocomplete="off">
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