Office Open XML
L Annex L. (informative) Primer
L.2 Introduction to SpreadsheetML
L.2.2 Sheets
L.2.12.5 Web Query

L.2.12.5 Web Query

A possible user interface for picking a web source is:

image

A possible rendering in the spreadsheet grid might be:

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L.2.10.3.5 Fifth EditL.2.13.5 Supporting Workbook Cache