inverted color display + AMOLED skin
As we all know lot of big smartphone manufacturers are using AMOLED displays in their flagship devices and also some other, smaller brands are following the trend. That trend is also slowly coming to Windows tablets, with Samsung being a leader in that area with their Galaxy TabPro S, 12'' Windows 10 flagship tablet, MS Surface pro 4 competitor. This year they are releasing updated model. To make long story short, hex black color (#000000) pixels on AMOLED screen are turned off, thus they don't use battery at all. Other dark pixels, if they are not hex black are not turned off but they also save a lot of battery. Darker the color, bigger the battery savings. Because of that I have following requests: (please note that screenshots used are from smartphone browsers, but the idea and meaning of written is same for Windows browsers)
inverted colors display
This is by far most important feature in order to save battery while surfing, and it also improves visibility outdoors without increasing brightness. Most webpages have white background and black text, and by using this feature it automatically invert colors meaning we would have white text on black backgorund. Here: http://imgur.com/a/R16Dp you can see webpage opened in Lightning Browser in inverted colors mode, it is "smart" enough not to invert photos or videos. Huge battery savings there.
Lot of mobile browsers has this and I think Windows Opera should have it too. Please take a look here: http://imgur.com/a/gJKyd - this is Puffin browsers dark theme, Lightning browser AMOLED theme is almost identical. Dark grey adress bar background and little bit lighter grey for url/search letters. Actually when you are typing letters are white so that you can clearly see, and when you hit enter they become grey. Everything else is hex black color (#000000). So much better on eyes and battery too. Ok, this is example from mobile browser but still, AMOLED theme should have hex black bar (all of them hex black, menu, controls, bookmarks), and dark gray background address bar and little bit lighter grey for url/search letters.
Those 2 suggestions combined, could save up to 30% battery while surfing. There are not so many AMOLED tablets, that is true. But Samsung flagship is there, and every Samsung flagship tablet is going to be AMOLED, and I am sure more and more manufacturers will follow.