But what happens if your js stack requires a feature that is only in chrome 65+ and someone elses stack relies on a feature that was depricated/removed in Chrom

But what happens if your js stack requires a feature that is only in chrome 65+ and someone elses stack relies on a feature that was depricated/removed in Chrome 60? Furthermore, does that mean if a user goes to task manager and ends the task of chrome, that your app would be killed too?