The Excel Services REST and SOAP APIs introduced in SharePoint 2010 are SharePoint only, but with the Excel Services JavaScript API you can work with embedded workbooks on a host web page — from ...

Table names must start with a letter, underscore, or backslash, with the remaining characters being letters, numbers, periods ...

If you come across data you want to add to an Excel spreadsheet, but copying and pasting it doesn’t work (or seems like too much work), you can also take a screenshot of the table. Then, you can ...