[mixmastamyk]

Just tried in firefox and as mentioned above they are not block elements but inline:

    <foo>foo</foo>
    <bar>bar</bar>
    <div>div1</div>
    <div>div2</div>

Results in:

    foo bar
    div1
    div2

[folkrav]

You're right, they are indeed considered inline elements, not blocks. My bad.