Removes all child elements of each element in the collection, and returns the collection.
In this example, click to empty the SVG root:
var svg = Pablo(demoElement).svg({height:100});
svg.on('click', function(){
svg.empty();
alert(svg.children().length + ' children');
});
svg.rect({width:100, height:100, fill:'red'});
svg.circle({cx:200, cy:50, r:50, fill:'purple'});
alert(svg.children().length + ' children');
This also removes any data or events associated with the removed child elements.