transition.node() Returns the first (non-null) element in this transition. If the transition is empty, returns null. Equivalent

transition.each(function) Invokes the specified function for each selected element, passing in the current

transition.select(selector) For each selected element, selects the first descendant element that matches the specified

transition.call(function[, arguments…]) Invokes the specified function exactly once, passing in this

selection.transition([name]) Returns a new transition on the given selection with the specified name

transition.tween(name[, value]) For each selected element, assigns the tween with the specified name

transition.attrTween(name[, factory]) If factory is specified and not null, assigns the attribute

transition.attr(name, value) For each selected element, assigns the