Summary: table.el tables with row and col spans are not getting exported
as expected on html export. 

Looks like the table markers gets recognized as strikethroughs, mdashes
and ndashes. This apparrently is getting in the way of proper
export. 

Furthermore I see no rowspans and colspans in the generated html.

Local settings:
(setq org-export-prefer-native-exporter-for-tables nil)

Attachments:

1. Input orgfile
2. html generated with C-c C-e h
3. html generated with M-x table-generate-source

Jambunathan K.