itwbennett writes "Yesterday's release of the Amazon Kindle Cloud Reader brought to mind the bad old days of the browser wars, but with a new twist: while the app works on any iOS device, it only works on computers with Safari and Chrome. Blogger Brian Proffitt knows as well as anyone that 'this isn't a deliberate snub of the other browsers. Clearly the developers of this web app had to get it to work on Safari, because that's the only vector to get it onto an Apple device. And, since both Chrome and Safari have a shared ancestor in WebKit, it makes sense that what would work in one browser would work in the other.' But it raises an interesting question: 'If HTML5 and other web technologies are supposed to be open and standardized, then will web app developers have to continually tweak their apps in order to accommodate deficiencies or advantages between browsers, or will browsers have to constantly stay in sync with each other's features just to be able to run all the web apps out there?'"