message: One line for prefix container
diff: @@ -62,9 +62,7 @@ export default class Field extends React.PureComponent {
  let prefixContainer = null;
  if (prefix) {
  - prefixContainer = <span className="mx_Field_prefix">
  - {prefix}
  - </span>;
  + prefixContainer = <span className="mx_Field_prefix">{prefix}</span>;
  }
  const classes = classNames("mx_Field", `mx_Field_${inputElement}`, {
  