Filter only computed properties that have some CSS rule associated

[aplicacionamedida]

The collection of all computed css properties can make problem rendering the snippet. For example, a fixed "width" and "height" can make rendering problems if the snippet doesn't use exactly the same font.

My proposal is to filter only the properties that have some CSS rule associated applying that property.

Based on these links:
https://stackoverflow.com/questions/2952667/find-all-css-rules-that-apply-to-an-element
http://www.javascriptkit.com/domref/cssrule.shtml