get inline SVG size in Firefox (AMD way)

svg-size.js

/* global
  define: false
*/

define( function ( ) {
  'use strict';

  function px( cs, prop ) {
    return parseInt( cs.getPropertyValue( prop ) || 0, 10 );
  }

  function getWidth( cs, sizing ) {
    var width = px( cs, 'width' );

    if ( ! /border-box/i.test( sizing ) ) {
      width += px( cs, 'borderLeftWidth' );
      width += px( cs, 'paddingLeft' );
      width += px( cs, 'paddingRight' );
      width += px( cs, 'borderRightWidth' );
    }

    return width;
  }

  function getHeight( cs, sizing ) {
    var height = px( cs, 'height' );

    if ( ! /border-box/i.test( sizing ) ) {
      height += px( cs, 'borderTopWidth' );
      height += px( cs, 'paddingTop' );
      height += px( cs, 'paddingBottom' );
      height += px( cs, 'borderBottomWidth' );
    }

    return height;
  }

  function size( element ) {
    var cs     = getComputedStyle( element );
    var sizing = cs.boxSizing || cs.webkitBoxSizing || cs.MozBoxSizing;

    return {
      width  : getWidth( cs, sizing ),
      height : getHeight( cs, sizing )
    };
  }

  return size;
});