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Whether you are developing a website or a web application, considering the way it will display and handle on different devices is an issue that you must deal with. When you fail to plan ahead for different devices and browsers, you can leave some fairly embarrassing gaps in your site. While it is true that most smartphones either ship with or can run an HTML5 capable browser, there are still legacy devices and proprietary browsers that render your code differently. This is where using mobile device emulators come into play.