selection.size() Returns the total number of elements in this selection.

zoom.duration([duration]) If duration is specified, sets the duration for zoom transitions on double-click and double-tap to the specified number of milliseconds and returns the zoom behavior. If duration is not specified, returns the current duration, which defaults to 250 milliseconds. If the duration is not greater than zero, double-click and -tap trigger instantaneous changes to the zoom transform rather than initiating smooth transitions. To disable double-click and double-tap transitio

path.closePath() Ends the current subpath and causes an automatic straight line to be drawn from the current point to the initial point of the current subpath. Equivalent to context.closePath and SVG’s “closepath” command.

d3.stackOrderDescending(series) Returns a series order such that the largest series (according to the sum of values) is at the bottom.

radialArea.endAngle([angle]) Equivalent to area.x1, except the accessor returns the angle in radians, with 0 at -y (12 o’clock). Note: typically angle is used instead of setting separate start and end angles.

d3.geoEckert1() d3.geoEckert1Raw The Eckert I projection.

locale.utcFormat(specifier) Equivalent to locale.format, except all directives are interpreted as Coordinated Universal Time (UTC) rather than local time.

radialLine(data) Equivalent to line.

request.user([value]) If value is specified, sets the user name for authentication to the specified string and returns this request instance. If value is not specified, returns the current user name, which defaults to null.

d3.geoMtFlatPolarParabolic() d3.geoMtFlatPolarParabolicRaw The McBryde–Thomas flat-polar parabolic pseudocylindrical equal-area projection.