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At Mercari US users can buy and sell things. While most of the application traffic comes from our mobile application (which we are rewriting as a ReactNative App right now), a big chunk of users use Mercari via web browsers, both desktop and mobile. The mobile web application is not simply a responsive version of the app, but it renders a lot of web components differently, and processes different user events, like "touch" instead of "click.In the right image above, I simulate a mobile web browse...