How to open excel file in browser with html code?

Answer 1

You can't get xls to iframe. But there's javascript plugins to turn excel file to json object.
https://stackoverflow.com/questions/8238407/how-to-parse-excel-file-in-javascript-html5

Answer 2

why not make a Google sheet out of the excel? https://support.google.com/docs/answer/37579?co=GENIE.Platform%3DDesktop&hl=en