I'm suprised by all this safari love in 2016. Working in front end web development, Safari has become the IE of today. Compatability and support for otherwise common web technologies is just plain broken.
Lets not forget that it was Google that forked WebKit resulting in duplicated effort to implement various features. Google also loves to ship stuff that isn't actually standardized yet (which is fine) but today's web developers go whine about Safari not supporting it yet. No shit Sherlock, it's your own myopic view.
Only testing in Chrome is as bad as only testing in IE 6 in 2006.
You may want to avoid that blanket statements around developers who've worked with indexeddb, safari's implementation is famously awful, so much so that caniuse makes special note of it.
Assuming we’re still talking about mobile Safari on iOS here, unfortunately that isn’t true in all areas. For example, the way iOS Safari handles HTML5 media elements is essentially to play them through a plug-in. We had to implement a whole new authentication mechanism for a site I work on that serves video content to logged in users, because it wasn’t actually Safari requesting the video resource so we weren’t seeing the user’s ID cookie. There are numerous other problems with how iOS Safari handles video content that make it difficult or impossible to implement other functionality or UI behaviour that would make our site better for our users.