transition.nodes() Returns an array of all (non-null) elements in this transition. Equivalent to
transition.node() Returns the first (non-null) element in this transition. If the transition is empty, returns null. Equivalent
transition.attrTween(name[, factory]) If factory is specified and not null, assigns the attribute
transition.each(function) Invokes the specified function for each selected element, passing in the current
transition.tween(name[, value]) For each selected element, assigns the tween with the specified name
transition.select(selector) For each selected element, selects the first descendant element that matches the specified
transition.attr(name, value) For each selected element, assigns the
selection.transition([name]) Returns a new transition on the given selection with the specified name
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