Returns a collection of the element(s)’s topmost <svg>
root nodes.
var screenA = Pablo.svg({name: 'A'}),
screenB = Pablo.svg({name: 'B'}),
container = Pablo(document.createElement('div'));
screenA.append(Pablo.circle());
screenB.append(Pablo.circle());
container.append([screenA, screenB]);
container.find('circle').root().each(function (screen) {
alert(screen.tagName + ' ' + Pablo(screen).attr('name'));
});