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the second table in section 12, and in the sample document, demonstrates an explicit <colgroup> but it omits the <tbody> element, violating the rule given a line or two above. <table> <colgroup> <col style="background-color:silver"/> <col style="background-color:gray"/> <col style="background-color:yellow"/> </colgroup> <tr> should be <table> <colgroup> <col style="background-color:silver"/> <col style="background-color:gray"/> <col style="background-color:yellow"/> </colgroup> <tbody> <tr> actually the first row of both tables would probably be better in thead rather than tbody, but that's unrelated to polyglot considerations.
Added to the sample and to the 16 December editor's draft. Thanks for catching this. E
mass-move component to LC1