prompt() not showing in MDN Playground - returns null immediately

MDN URL

https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting/What_is_JavaScript

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

When testing JavaScript examples that use prompt(), the dialog never appears in the MDN Playground.
The function returns null immediately.

What did you expect to see?

I expected the prompt dialog box to appear when the button is clicked,
allowing me to type a name and update the text content dynamically.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

Safari browser console message after button click: Use of window.prompt is not allowed in a sandboxed frame when the allow-modals flag is not set.

MDN metadata

Start with the MDN page at Learn_web_development/Core/Scripting/What_is_JavaScript and its content entry at en-us/learn_web_development/core/scripting/what_is_javascript/index.md. Reproduce the prompt() example in the MDN Playground, inspect the sandbox behavior described in the Safari console, and confirm that the dialog appears and the example updates its text when the button is clicked.