I'm trying to move a ruby-text element to the right and neither of the following approaches are working:

* Relative position:
  <ruby>
    <rt style="position: relative; left: 200px;">foobar</rt>
  </ruby>

* Left margin:
  <ruby>
    <rt style="margin-left: 200px;">foobar</rt>
  </ruby>

The "foobar" text is placed in the same position than in:
  <ruby>
    <rt>foobar</rt>
  </ruby>

In Firefox in both cases the ruby-text is moved 200px to the right.