Why are marketplace/custom visualizations throwing a `document is sandboxed and lacks the 'allow-same-origin'` error? (Community)

View the original community article here

Last tested: Mar 24, 2021
 

You might see the following with an error similar to DOMException: Failed to read the `cookie` property from 'Document': The document is sandboxed and lacks the 'allow-same-origin' flag when viewing a marketplace/custom visualization after updating to 7.20:

​

Chances are you had the "Sandboxed Custom Visualizations" labs feature enabled prior to the update and will need to disable the newly introduced in "Unsafe Custom Visualizations" legacy feature:

This can also come up with a message like Uncaught DOMException: Failed to read the serviceWorker property from Navigator: Service worker is disabled because the context is sandboxed and lacks allow-same-origin flag