> These messages can be used to alert the user of new content or updates, remind them of upcoming events or deadlines, or provide other important information.

> These messages can be used to alert the user of new content or updates, remind them of upcoming events or deadlines, or provide other important information. Or even information that's not important, I guess. If a website has an update, well, sure they can "push" it; but why don't they just push it to their production server? It's obviously driven by the demands of advertisers, and any site that succeeds in pushing notifications my way is a site I won't be visiting again.