nl_tokens: Needed for dashed lines .
pl_tokens: function ( div ) { var sizeSpan = <mask> . createElement ( 'span' ) ; sizeSpan . setAttribute ( 'style' , 'margin: 0; padding: 0 0 0 1em; border: 0;' ) ; div . appendChild ( sizeSpan ) ; var oneEmWidth = sizeSpan . offsetWidth ; div . removeChild ( sizeSpan ) ; return oneEmWidth ; }