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Would it be helpful to be able to display certain buttons or other elements at a set physical dimension as opposed to pixel dimensions? For example, always show a button big enough for a finger (e.g., 1.5 cm). I ask because we recently launched a web app (www.lifesizer.com) that allows sites to display images in actual life size and think it could be great for designing mobile web sites, but comes with other implications for design, such as modifying layouts for devices with different screen sizes even if they have the same pixel dimensions.

We are currently focused on ecommerce and product review sites, but would love to hear if people think it would be helpful for a new take on responsive design.

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