nl_tokens: Load visible elements
pl_tokens: function checkLazyElements ( ) { if ( ! elements . length ) { return ; } topLazy = Infinity ; calcViewport ( ) ; var i = elements . length - 1 , srcAttr = options . srcAttr ; for ( ; i >= 0 ; i -- ) { var $el = elements [ i ] , el = $el [ 0 ] ; // remove items that are not in DOM if ( ! $ . contains ( document . documentElement , el ) ) { elements . splice ( i , 1 ) ; } else if ( ! options . visibleOnly || el . offsetWidth > 0 || el . offsetHeight > 0 ) { var offset = $el . offset ( ) , elTop = offset . top , elLeft = offset . left ; if ( ( elTop < viewportBottom ) && ( elTop + $el . <mask> ( ) > viewportTop ) && ( elLeft < viewportRight ) && ( elLeft + $el . width ( ) > viewportLeft ) ) { var src = $el . attr ( srcAttr ) ; if ( src ) { el . src = src ; } elements . splice ( i , 1 ) ; } else { if ( elTop < topLazy ) { topLazy = elTop ; } } } } }