let deferredPrompt = null;
but code not the issue.
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Dreamweaver CS6 was written about 8 years ago, way before ECMAScript 6. It is therefore best to ignore the message.
Legacy CS6 is beyond support and no longer updated. Switch to a modern code editor (Brackets, Sublime, VS Code, DW CC 2020, etc...).
Excellent Nancy, Ben. I would update my coding framework.