Nested Q element (nested short quotations) incorrectly rendered

Code example of nested quotations with the Q element from HTML 4.01, section 9.2.2 example on Rendering nested quotations is

<p>John said, <Q lang="en-us">I saw Lucy at lunch, she told me <Q lang="en-us">Mary wants you
to get some ice cream on your way home.</Q> I think I will get some
at Ben and Jerry's, on Gloucester Road.</Q></p>

Actual (live) results in your browser

John said, I saw Lucy at lunch, she told me Mary wants you to get some ice cream on your way home. I think I will get some at Ben and Jerry's, on Gloucester Road.

Expected results (matching [preferably double] quote marks for outer quotation and matching [preferably single] quote marks for inner quotation matter here)

John said, "I saw Lucy at lunch, she told me 'Mary wants you
to get some ice cream on your way home.' I think I will get some
at Ben and Jerry's, on Gloucester Road."

This absence of support has also been explained and testcase-ed by Aaron Gustafson in his Support Q in IE.next Wishlist

Firefox 2.x, Firefox 3, Seamonkey 1.x, Seamonkey 2.x, K-meleon 1.x, Epiphany 2.22, Galeon 2.0.4 all pass this test.