This test page will be cached by a ServiceWorker after the first load. This is
useful to test which chrome.declarativeNetRequest, chrome.webRequest and
chrome.webNavigation events fire for ServiceWorker cached navigations.
Install the test Chrome extension,
open the extension console and look at the logs to see which event fire
when you refresh the page. You should see that the webNavigation events always
fire for the navigation, but the declarativeNetRequest and webRequest events
do not fire for ServiceWorker cached requests.