The html file is used as a standalone html viewer to locally view research reports generated by Allen AI's asta (https:// asta.allen.ai) by clicking on "Generate report". You can then download the report as json by clicking on "Download Report" when the report is complete.
Download the html file above, and open it in your browser. Drag one of the reports you downloaded from asta into the box on the html page. You will see it rendered nicely and locally.
Disclaimer: I am not affiliated with Allen AI or their asta product in any way - just a big fan and use this feature (their deep research) a lot.