d3.js - d3 drag works but appear Uncaught TypeError: a.target.className.indexOf is not a function -


i practice use d3 drag svg circle around.

it works except following error appeared in console: "uncaught typeerror: a.target.classname.indexof not function"

what wrong code? following code:

<!doctype html> <html lang="zh-hant">   <head>     <title></title>     <meta charset="utf-8">     <script src="http://d3js.org/d3.v3.min.js"></script>   </head> <body>   <p>     <svg width="300" height="200">         <circle cx="100" cy="100" r="5" fill="red" />         <circle cx="50" cy="70" r="5" fill="red" />     </svg>   </p>   <script>      var drag = d3.behavior.drag()       .on("drag", function () {          d3.select(this).attr("cx", d3.event.x)                         .attr("cy",d3.event.y);           });     d3.selectall('circle').call(drag);   </script> </body> </html>

this because of google translate extension. disabling solves problem.


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