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You've got a few options ...
- the HTML form can write to a database, and Tableau reads from there (directly or via TDE). In Tableau Server you can schedule the TDE refresh to be daily/weekly/etc..
- Using Google Forms you can write to a Google Sheet and then Tableau can read that as well (I haven't done this, but there's plenty of chatter about it)
- use an ETL tool like Alteryx to load the Excel data into a database and Tableau reads the data from there.