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re: What is the difference (pros / cons) between link rel="worker" and script src="worker" implementation?
 

<script src=sw.js></script> will not register the script as a Service Worker (running in a background thread).
You need to navigator.serviceWorker.register('/path/to/your/worker.js') for that.
I used <link rel="worker" href="sw.js"> because it allows me to give a relative URL, but get an absolute URL when accessing the href attribute.

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