I am using d3js to find the width of an svg element the code given below:

<script>

    var body = d3.select(body);

    console.log(body);

    var svg = body.select(svg);

    console.log(svg);

    console.log(svg.style(width));

</script>



<svg class=svg height=3300 width=2550>

   <image x=0 y=0 height=3300 width=2550 xlink:href=1.jpg></image>

   <rect class=word id=15 x=118 y=259 width=182 height=28

      text=Substitute></rect>

</svg>

But it returned this error:

Uncaught TypeError: Cannot call method 'getPropertyValue' of null

I think, the svg variable is a null array.

How can I get the width of an svg element using d3js?