nl_tokens: Appends an arrow head marker to the defs element to be used later .
pl_tokens: function createColorArrow ( defElement , color ) { defElement . append ( "marker" ) . attr ( "id" , "arrow-" + color ) . attr ( "viewBox" , "0 -5 10 10" ) . attr ( "refX" , 8 ) . attr ( "markerWidth" , 6 ) . attr ( "markerHeight" , 6 ) . attr ( "fill" , color ) . attr ( "orient" , "auto" ) . <mask> ( "path" ) . attr ( "d" , "M0,-5L10,0L0,5" ) . attr ( "class" , "arrowHead" ) ; }