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POInaccurate rem units in Opera12 and IE9
 

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    <p>Although I'm not new to the idea of responsive design I have experienced a very troublesome thing...</p> <p>I have decided to completely move to <code>rem</code> units, but I still follow <code>62.5%</code> rule (I have used it with <code>em</code>).</p> <p>So for starters:</p> <pre><code>html { font-size: 62.5%; } </code></pre> <p>I assume that <strong>1rem = 10px</strong> (I know it's not always true, but hey, it's for me to ease math a little bit, for browser it's still relative right?)</p> <p>Horror starts in <strong>Opera</strong> (<strong>12.12</strong> both linux and win version, where default font-size is set to <code>14px</code> and <code>16px</code> respectively).</p> <pre><code>header nav ul li a span { padding: 1.8rem 2.7rem 3rem 0; font-family: 'sawasdeebold', sans-serif; font-size: 2rem; line-height: 3rem; letter-spacing: -0.3rem; display: block; } </code></pre> <p>As You can see part of my navigation is let's say "pixel perfect" thanks to using <code>rem</code> units. Under linux page is a little bit narrower (that's no problem the font is smaller so <code>1rem</code> represents less pixels). However everything in <code>nav</code> scales badly if default size is changed to something else than <code>14px</code>... Under Windows the same is true for <code>16px</code>... The whole scaling idea just doesn't work. I don't need every pixel to match, but it looks ugly...</p> <p><img src="https://i.stack.imgur.com/dCFGx.png" alt="Navigation in rems"></p> <p>The similar problem appears under <strong>IE9</strong>, but this time is the logotype where:</p> <pre><code>header h1 a { margin: 1.8rem 0 0 1.6rem; width: 46.2rem; height: 10.1rem; background: transparent url(../static/img/logotype.jpg) 0 0 no-repeat; background-size: 46.2rem 20.2rem; text-indent: -5000px; display: block; } header h1 a:hover { background-position: 0 -10.1rem; } </code></pre> <p>Even though I set logotype's height and the exact size for its background, on hover, the background is positioned <code>1px</code> too low...</p> <p>Aside of these problems I have one, general question.</p> <p>Is it POSSIBLE to create "pixel perfect" layouts with <code>rem</code> units?</p> <p>I haven't even touched media queries yet and I want to know if it's worth my effort...</p> <p>BIG THANKS guys!</p>
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    1. COIndeed `rem` is based on user-set value, but I use `rem` not only for `font-size`. I use these units to also set widths, heights, paddings etc. so everything scales with `font-size` set in the browser. At least in all browsers except Opera and (no suprise) IE. About your question... Well, my layout really isn't that complicated, but I really like my navigation to fit the background I set (this the only element which is positioned so carefully). I like minimalistic approach very much, but I don't want to throw away my design :(
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    2. CO"pixel perfect" is not made for rem unit. You can see the rem units like "Elastic Pixels" related to general dimensions.
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    3. COI understand that perfectly that is why I used "" around "pixel perfect" :)... It's not really pixel perfect in most parts it's fluid I use `%` and `min-width` for positioning purpose wherever I can.
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