This site is used to test deployment of Geogebra resources to a Google Site,
with results sent to Google Sheets.
The reference resource (from which edits can be done (via online or desktop then uploaded online) , before extraction to a html file on a local drive, and subsequently uploaded and being embedded here as html code, with ggbBase64 coding) can be found at https://www.geogebra.org/m/hyxcgjch on the Geogebra resources website.
Refer to the reddit forum link at
https://www.reddit.com/r/geogebra/comments/1c5cfvo/breaking_change_javascript_sandboxing_from_v839/
How to : Download the html file of the Geogebra resource to embed it on a Google Site. You Tube video
Read also about Advanced Integration of Geogebra into your website at https://www.geogebra.org/m/sehv2qc9