Error: An A Start Tag Seen But An Element Of The Same Type Was Already Open

My doctype is html5. I am validating this HTML: the spec:

Content model: Transparent, but there must be no interactive content descendant.

Interactive content is:

aaudio (if the controls attribute is present) buttondetailsembediframeimg (if the usemap attribute is present) input (if the type attribute is not in the Hidden state) keygenlabelobject (if the usemap attribute is present) selecttextareavideo (if the controls attribute is present)

So your options are:

1. Ignore the validator and keep it as it is (you have no right to expect all browsers to behave in the same way in this case)
2. Choose a different markup structure altogether
3. Replace either the block level or child links with normal elements and click events