nl_tokens: this is a local copy of certain logic from ( Abstract ) Element . getStyle to break a dependancy between the supports mechanism and Element use this instead of element references to check for styling info
pl_tokens: function ( element , styleName ) { var view = element . ownerDocument . defaultView , style = ( view ? view . getComputedStyle ( <mask> , null ) : element . currentStyle ) || element . style ; return style [ styleName ] ; }