nl_tokens: Transform Data URL to array buffer .
pl_tokens: function dataURLToArrayBuffer ( dataURL ) { var base64 = dataURL . replace ( REGEXP_DATA_URL_HEAD , '' ) ; var binary = atob ( base64 ) ; var arrayBuffer = new ArrayBuffer ( binary . length ) ; var uint8 = new Uint8Array ( arrayBuffer ) ; forEach ( uint8 , function ( value , i ) { uint8 [ i ] = <mask> . charCodeAt ( i ) ; } ) ; return arrayBuffer ; }