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    <p>The following is from <a href="http://www.adobe.com/devnet/dreamweaver/articles/introducing-media-queries.html" rel="noreferrer"><strong>Adobe docs</strong></a>.</p> <hr> <p>The media queries specification also provides the keyword <code>only</code>, which is intended to hide media queries from older browsers. Like <code>not</code>, the keyword must come at the beginning of the declaration. For example:</p> <pre><code>media="only screen and (min-width: 401px) and (max-width: 600px)" </code></pre> <p>Browsers that don't recognize media queries expect a comma-separated list of media types, and the specification says they <strong>should</strong> truncate each value immediately before the first nonalphanumeric character that isn't a hyphen. So, an old browser <strong>should</strong> interpret the preceding example as this:</p> <pre><code>media="only" </code></pre> <p>Because there is no such media type as only, the stylesheet is ignored. Similarly, an old browser <strong>should</strong> interpret </p> <pre><code>media="screen and (min-width: 401px) and (max-width: 600px)" </code></pre> <p>as </p> <pre><code>media="screen" </code></pre> <p>In other words, it should apply the style rules to all screen devices, even though it doesn't know what the media queries mean.</p> <p><strong>Unfortunately, IE 6–8 failed to implement the specification correctly.</strong></p> <p>Instead of applying the styles to all screen devices, it ignores the style sheet altogether.</p> <p>In spite of this behavior, it's still recommended to prefix media queries with only if you want to hide the styles from other, less common browsers.</p> <hr> <p>So, using </p> <pre><code>media="only screen and (min-width: 401px)" </code></pre> <p>and</p> <pre><code>media="screen and (min-width: 401px)" </code></pre> <p>will have the same effect in IE6-8: both will prevent those styles from being used. They will, however, still be downloaded.</p> <p>Also, in browsers that support CSS3 media queries, both versions will load the styles if the viewport width is larger than <code>401px</code> and the media type is screen.</p> <p>I'm not entirely sure which browsers that don't support CSS3 media queries would need the <code>only</code> version</p> <pre><code>media="only screen and (min-width: 401px)" </code></pre> <p>as opposed to</p> <pre><code>media="screen and (min-width: 401px)" </code></pre> <p>to make sure it is not interpreted as</p> <pre><code>media="screen" </code></pre> <p>It would be a good test for someone with access to a device lab.</p>
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    1. POWhat is the difference between "screen" and "only screen" in media queries?
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