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

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

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

d3.active(node[, name]) Returns the active transition on the specified node with the specified name

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

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

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