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    copied!<p>I could reproduce the problem on my machine with emulator at display resolution of 2560x1440 with canvas as below.</p> <pre><code>&lt;Canvas Width="4" Height="4"&gt; &lt;Rectangle Width="4" Height="4" Fill="Blue" &gt;&lt;/Rectangle&gt; &lt;/Canvas&gt; </code></pre> <p>For above snippet - canvas overflows/goes-beyond the red panel.</p> <pre><code>&lt;Canvas Width="6" Height="6"&gt; &lt;Rectangle Width="6" Height="6" Fill="Blue" &gt;&lt;/Rectangle&gt; &lt;/Canvas&gt; </code></pre> <p>For above snippet - canvas underflows/does-not-fit the red panel, and leaves some space on right margin of the red panel.</p> <p>if the canvas size is kept multiple of 5, it fits properly in red panel. </p> <p>It does not seem to be an issue with Path since it reproduces with rect also. It seem to be issue with ViewBox scaling. I found that with <code>UseLayoutRounding="False"</code> on stackpanel - issues does not reproduce. I also found a <a href="https://stackoverflow.com/questions/1857289/why-does-uselayoutrounding-not-seem-to-work-with-viewbox">related thread</a> when looking around for ViewBox scaling issues. It suggest to use <code>SnapsToDevicePixels</code> property but that is not available for windows store xaml apps.</p> <p>In summary, it seem to be an issues with ViewBox scaling though I am not a pro with internal knowledge of viewbox scaling algo. Possible workaround is to set UseLayoutRounding to false if it passes the test on another machine. The multiple of 5 does not look like as good workaround but you can check. On a separate note - if you were just curious to know why it is happening, you get the answer and may be underflow/overflow of few pixels may out matter for your application.</p>
 

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