The easiest way to add a spreadsheet is to just include a div tag with a
data-treb attribute pointing to the file:
If you add both of those to your web page, you should get this:
The script will set up everything. You can set some options when using the embed tag; see this page for details.
There is a default size for embedded spreadsheets, but if your containing element has a size (if you set it in your page style, for example), the spreadsheet will stay that size. Spreadsheets are resizable by default, but you can disable that.