To prevent IE from throwing errors when 'invalid' values are provided, the line of code that sets a value to style property has been wrapped by a try/catch (see #5509)

This has a highly negative impact on performance both in Safari5 and Opera11, as shown by this test: http://jsperf.com/try-catch-impact-style#results

We could add a feature test to jQuery to detect when the browser throws an error for an invalid value and add it to jQuery.support.invalidStyle.

We would then change the code in css.js to

jQuery.support.invalidStyle ?
    try { style[ name ] = value; } catch(e) {}:
    style[ name ] = value;