I can't reproduce this with a code snippet, but I got

TABLE
BORDER=0

for node.TagName and

<table border=0 cellspacing="2" cellpadding="2" width="100%">...</table
border=0>

for node.ElementHtml(). (Yes, with the line breaks.)

Something tells me that doesn't satisfy the HTML5 parsing rules... by then again, I've never read them. [:-)] Either way, you may want something for it in your tests.