Print rows with column headers on top of every page
From the Excel for web help section:
If a worksheet spans more than one page, you can print row and column headers or labels (also called print titles) on every page. For example, you can repeat the first row of column headers on all pages when you have large, complex worksheets.
This feature is not available in Excel for the web.
If you have the Excel desktop application, you can use the Open in Excel button to open the workbook and print rows with column headers.
Please add this feature for Excel for Web.