Test WYSIWYG Table Edit.

(0) Edit the page.
(1) In your spreadsheet, select the region of interest.
(2) Copy to Clipboard
(3) In this document, place your cursor where you want a table (between STARTINCLUDE and STOPINCLUDE below).
(4) Paste from Clipboard at insertion point
(5) SAVE
(5) See the result on the page TestTableEditInclude

Notes:

• Having pure text TSV (Tab Separated Values) on the clipboard does not seem to be enough to create and populate a table. :-(
  

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• Preference for the editor, default is the WYSIWYG editor. The options are raw, wysiwyg:
  • Set EDITMETHOD = wysiwyg

-- Dick Furnas - 2021-02-17