(This chart is a part of the d3-charts
collection available [here][collection].)
This chart displays the share of votes over time between two Danish parliamentary coalitions using placeholder data. The chart here has been used for two coalitions, but can also be used for two candidates.
You will notice something enveloping the line charts, which is the [confidence interval][ci], which indicates the spectrum of the confidence in our displayed results---to use a completely unscientific definition.
Compare this to [Sam Wang's chart for the U.S. 2012 election][wang] and [Drew Linzer's charts for individual states][votamatic].