title: SVG xml:space attribute issue
body: <p>I have a SVG document. In the document there is one <code>flowRoot</code> element with some text and a
  <code>text-align:center</code> attribute. But the text will not get centered because it contains some white spaces at the start. I do not know where these white spaces come from, but there is an  <code>xml:space="preserve"</code> attribute in the document. After removing this attribute, the white spaces are gone. Can anybody explain to me why this is happening?</p>