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    <p><strong>Short answer:</strong><br> No. It is NOT possible/documented.<br> And even if determined experimentally, it is NOT guaranteed to remain the same in future.</p> <p><strong>Long answer:</strong><br> At sub-pixel accuracies, there is a lot of variance among Browsers/OS/HW about how the input is captured/rendered. With h/w acceleration being enabled on most modern browsers, there are a large number variations in rendering across different PCs running different browsers on different operating systems. So much so that, it is possible to even identify every unique user by the slightly different <a href="http://cseweb.ucsd.edu/~hovav/dist/canvas.pdf" rel="nofollow"><strong>variations in the rendered output of a common sample</strong></a>.</p> <p>Rather than worrying about the discrepancies in the underlying frameworks, How about designing the UI of your drawing application to be independent of those problems. Couple of methods i can think of right now are:</p> <ol> <li><p>Allow editing the image at zoomed/magnified levels.</p></li> <li><p>Design a snap-to-grid method for elements.</p></li> </ol> <p><strong>Update:</strong><br> The "zoom" operation would your custom implementation and NOT a feature of the underlying frameworks. So if you need sub-pixel accuracy to the order of 1/10th of a pixel, one would need to have a 10x_zoom() implemented as part of you web-app which would render the data from</p> <p>1st pixel --> 10x10pixels at (0,0),<br> 2nd pixel --> 10x10pixels starting from (11,11).</p> <p>This way one would have a very magnified view of the data, but the framework is blissfully unaware of all this and renders accurate to the onscreen-pixel(which in our case now is 1/10th of the image pixel).</p> <p>Also an important thing to note that this operation would consume a lot of memory if done for the entire image at once. Hence doing this for ONLY the visible part of the image in a "zoom-window" would be faster and a less memory intensive process.</p> <p>Once implemented in your drawing web-app the sub-pixel inaccuracies in the frameworks might not turn out to be a problem for the user as he can always switch into these modes and provide accurate input.</p>
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    1. POWhat is the current state of sub-pixel accuracy in the major browsers?
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    1. COanyone else with experience in designing drawing apps, feel free to add your favorite method(s) to capture accurate input...
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      1. USTheCodeArtist
    2. COThe problem with zooming is that this is precisely when sub-pixel inaccuracies show up. If I have an image, created in say Photoshop or Illustrator, that is placed in a document at 0,0 and set to 14.42 pixels wide (or, more commonly, a value in points or cm that evaluates to such a pixel width), then when I open that document in a browser and zoom in, the discrepancy between 14.42 and the rounded 14 pixels is very obvious. Relative to an adjacent item placed at 15 pixels, it seems to have moved to the left. At least in Flash it will actually be 14.4 pixels wide (accurate to the nearest twip).
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      1. USJude Fisher
    3. COok. What i kinda assumed in my solution was that the "zoom" operation would be a custom implementation in the application and not derieved from the underlying frameworks. Updated the answer to mention the same.
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