Generating e-pub and html indexes

The DocBook stylesheets do a terrific rendering of an index to PDF. Just amazing!
However, rendering to e-pub and html it is not as specific, pointing to the beginning of a chapter/section.

Is there a way to generate an index for e-pub and html that will generate an index like the PDF output?

Every <indexterm/> used is given a unique xml:id.

With thanks for any assitance - Paul