capitalize = function (token) {
  return token[1].toUpperCase();
}
This is a list of all SVG attributes that need special casing,
namespacing, or boolean value assignment.

When adding attributes to this list, be sure to also add them to
the `possibleStandardNames` module to ensure casing and incorrect
name warnings.

SVG Attributes List:
https://www.w3.org/TR/SVG/attindex.html
SMIL Spec:
https://www.w3.org/TR/smil