A couple of weeks ago somebody asked me if it was possible to create an accordion template from the grouping display template.
Note: here is the original grouping template post - Grouping search results with display templates for the CSWP
For these templates I made use of jQuery UI to get the accordion styling on the template. Once I had the accordion version, I also made a tabbed version so that you can choose.
Accordion template
The result of the accordion template looks like this:
Note: styling is up to you, I included the Smoothness CSS file from jQuery UI in this template.
The template can be downloaded from the SPCSR GitHub repository: jQuery UI Accordion Display Templates.
Tabbing template
The result of the template with tabs looks like this:
The template can be downloaded from the SPCSR GitHub repository: jQuery UI Tabs Display Templates.