How do websites know they're not the default home page or search provider?
As far as I'm aware, there is no public API exposure of a browser's default homepage/search provider. So how does Google know to display this? It only comes around when Google's not the default homepage / default search provider on my browser.
I can only assume they're inferring from numerous variables, such as the referrer. I wasn't able to successfully dig down into Google's compiled JavaScript. I'm not even sure if it's detected client-side or server-side.
I'm on Firefox 44, but I've seen these banners on Chrome, too.
Simply there is no way to do that with JavaScript because the "default search/homepage" is a user's preference and you do not have access to that without user's permission because that would be a security/privacy issue.
What Google does at every user visit is show a promo ad with a close icon and a go button with instructions on how to set it as the default homepage. On click of any one of them, it creates 2 cookies so that next time it will check your cookies and make the promos disappear. Even when Google is your homepage and you clear your cookies then a banner is still there to promote Google as your homepage.
I have checked this with Firefox, not aware of Chrome.
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