Second, service workers don't have access to DOM. First, service workers are terminated when not in use and restarted when needed (similar to event pages). When migrating to this new background context, you'll need to keep two main things in mind. Service workers were inspired in part by background pages in Chrome Extensions, but they iterate and improve on this model by tuning it for web-scale. As stated in Service Workers: an Introduction, a "service worker is a script that your browser runs in the background, separate from a web page, opening the door to features that don't need a web page or user interaction." This is the technology that enables native-like experiences such as push notifications, rich offline support, background sync, and "Add to Home Screen" on the open web. In Manifest V3, the Chrome extension platform moves from background pages to service workers. This allows extensions to observe and take action in response to events. To put it simply, background pages provide extension authors with an environment that lives independent of any other window or tab. Background pages have been a fundamental component of the Chrome Extension platform since its introduction.
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