I keep seeing Bing in my optional updates. It gives a little information but I'm still confused. Bing Desktop sets the daily Bing photo as the desktop background and adds a floating search bar. It DOES change the background daily.. Windows 10 Pro - Start10 - part of a local network which is a '3rd party optimizer-free' zone..
2.2.4 HTTP OPTIONS Response. After receiving an HTTP OPTIONS request, a server responds with an HTTP OPTIONS response that specifies the protocol versions it supports.
Javascript & jQuery. Responsive design is still coming of age and not all browsers will support all techniques. Javascript shims and polyfills will help plug the gaps where some techniques are natively supported. The most basic of examples is Respond.js which acts as a polyfill for IE8 and lower.