>Anyone would have the proper syntax to split that line into several lines:


I use this general style:

If it's a single ternary:

largest = ((a > b) ? a : b);

If it's a multi-clause ternary (such as your example), I always:

(1) Put parenthesis around the test clause
(2) Indent each true and false clause within

return (typeof loWindow.pageYOffset != 'undefined') ?
        loWindow.pageYOffset :
        (document.documentElement.scrollTop) ?
            (document.documentElement.scrollTop) : 
            (document.body.scrollTop) ? 
                document.body.scrollTop :
                0