Only subset of HTML supported by HTML class?

Greetings,

I am trying to render some HTML.  I am using:

       RootLayoutPanel rlp = RootLayoutPanel.get();

        rlp.clear();

        rlp.add(new HTML("abcde <strong>hello</strong> <em>emphisized</em> the<br>break <b>bold text</b><ol><li>aaaaa</li><li>bbbbbb</li></ol>", true));

The <b> and <br> work.  All the rest is ignored.  Why is only a subset supported?  I don't understand why it wouldn't just insert what I specify.  Is there a way for me to add arbitrary html?

Thanks.

Blake

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