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    copied!<p>"What were they thinking" is extensively covered in <a href="http://blogs.msdn.com/b/b8/archive/2012/03/21/scaling-to-different-screens.aspx" rel="nofollow noreferrer">this blog post</a>.</p> <p>You'll also see described how scaling for pixel density is automatic:</p> <blockquote> <p>For those who buy these higher pixel-density screens, we want to ensure that their apps, text, and images will look both beautiful and usable on these devices. Early on, we explored continuous scaling to the pixel density, which would maintain the size of an object in inches, but we found that most apps use bitmap images, which could look blurry when scaled up or down to an unpredictable size. Instead, Windows 8 uses predictable scale percentages to ensure that Windows will look great on these devices. There are three scale percentages in Windows 8:</p> </blockquote> <pre><code>100% when no scaling is applied 140% for HD tablets 180% for quad-XGA tablets </code></pre> <blockquote> <p>The percentages are optimized for real devices in the ecosystem. 140% and 180% may seem like odd scale percentage choices, but they make sense when you think about how this will work on real hardware.</p> <p>For example, the 140% scale is optimized for 1920x1080 HD tablets, which has 140% of the baseline tablet resolution of 1366x768. These optimized scale factors maintain consistent layouts between the baseline tablet and the HD tablet, because the effective resolution is the same on the two devices. Each scale percentage was chosen to ensure that a layout that was designed for 100% 1366x768 tablets has content that is the same physical size and the same layout on 140% HD tablets or 180% quad-XGA tablets.</p> </blockquote> <p><img src="https://i.stack.imgur.com/tudTf.png" alt="enter image description here"></p>
 

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