That's almost certainly implemented by looking for HTML offline cache manifests. https://developer.mozilla.org/en-US/docs/HTML/Using_the_application_cache http

That's almost certainly implemented by looking for HTML offline cache manifests. https://developer.mozilla.org/en-US/docs/HTML/Using_the_application_cache https://developer.mozilla.org/en-US/docs/HTML/Using_the_appl...