Retrieves a computed style value of a node. It returns empty string if the
value cannot be computed (which will be the case in Internet Explorer) or
"none" if the property requested is an SVG one and it has not been
explicitly set (firefox and webkit).
Retrieves a computed style value of a node. It returns empty string if the value cannot be computed (which will be the case in Internet Explorer) or "none" if the property requested is an SVG one and it has not been explicitly set (firefox and webkit).
Copied from Closure's goog.style.getComputedStyle