How to get the background color of an HTML element?

by

Get at number:

window.getComputedStyle( *Element* , null).getPropertyValue( *CSS* );

Example: 

window.getComputedStyle( document.body ,null).getPropertyValue('background-color');  
window.getComputedStyle( document.body ,null).getPropertyValue('width');  
~ document.body.clientWidth

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