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POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
 

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  1. POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
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    <p>I'm trying to create an iOS 7 style frosted look with HTML5, CSS3 and JavaScript which can work on webkit browsers.</p> <p>Technically, given the following HTML:</p> <pre><code>&lt;style&gt; #partial-overlay { width: 100%; height: 20px; background: rgba(255, 255, 255, .2); /* TODO frost */ position: fixed; top: 0; left: 0; } &lt;/style&gt; &lt;div id="main-view"&gt; &lt;div style="width: 50px; height: 50px; background: #f00"&gt;&lt;/div&gt; To my left is a red box&lt;br&gt; Now there is just text&lt;br&gt; Text that goes on for a few pixels &lt;br&gt; or even more &lt;/div&gt; &lt;div id="partial-overlay"&gt; Here is some content &lt;/div&gt; </code></pre> <p>I'd like to apply something like a <code>-webkit-filter: blur(5px)</code> to the first 20px horizontally of <code>#main-view</code>.</p> <p>If the CSS was modified to be <code>#partial-overlay { width: 20px; height: 100%; ...}</code> then I'd need to apply the <code>-webkit-filter: blur(5px)</code> to the first 20px vertically.</p> <p>The obvious solution is to use javascript to make a clone of the <code>#main-view</code>, set <code>overflow: hidden</code> and then change the width/height as appropriate but that seems to me hard to generalize to more complex pages/CSS structures.</p> <p>Is there a better way to achieve this with minimal performance hit and maximal generalizability?</p> <p><strong>EDIT</strong>: Here is an example of what I'm trying to achieve: <img src="https://i.stack.imgur.com/cyKkw.png" alt="Mockup"></p>
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    1. USAaron Yodaiken
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      1. POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
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    1. COCSS is an all or nothing thing. You can't just apply a property to an arbitrary portion of it. The closest you can get to "only the first 20px" is by using the `:first-line` pseudo element.
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      1. POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
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    2. CO@cimmanon see edited "obvious solution"
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      1. POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
      1. USAaron Yodaiken
    3. COCould you show an image example of what you're looking to do? If I read the issue correctly you could try using the multiple backgrounds ability of css to achieve this. EDIT: also, here's a JSFIDDLE of his example for anyone who's answering this and want to test: http://jsfiddle.net/c6Lwf/
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      1. POHow to use CSS (and JavaScript?) to create a blurred, "frosted" background?
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