Following issues have been fixed in this commit:
 - SVG top element should not use `getComputedStyle` since it
 produces invalid CSS in chrome. Instead, just use `style` attribute.
 - When `xlink:href` is being used in SVG make sure that selectors are
 properly escaped
 - Use browser-provided CSS parsing when embedding images and
 fonts.
 - Fix a bug in deferred insertion of CSS rules.
 - Fix a test for svg-use-tag

fix: svg and css parsing