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                  <a href="https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/javascript/new-api_browser.md" title="Edit this page" class="md-content__button md-icon">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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                <h1 id="browser-and-screen-sizes-javascript-api">Browser and Screen Sizes - JavaScript API<a class="headerlink" href="#browser-and-screen-sizes-javascript-api" title="Permanent link">#</a></h1>
<h2 id="uiscreen"><code>Ui/Screen</code><a class="headerlink" href="#uiscreen" title="Permanent link">#</a></h2>
<p>CSS offers powerful media queries that alter the layout depending on the screen
sizes, including but not limited to changes between landscape and portrait mode
on mobile devices.</p>
<p>The <code>Ui/Screen</code> module exposes a consistent interface to execute JavaScript code
based on the same media queries that are available in the CSS code already. It
features support for unmatching and executing code when a rule matches for the
first time during the page lifecycle.</p>
<h3 id="supported-aliases">Supported Aliases<a class="headerlink" href="#supported-aliases" title="Permanent link">#</a></h3>
<p>You can pass in custom media queries, but it is strongly recommended to use the
built-in media queries that match the same dimensions as your CSS.</p>
<table>
<thead>
<tr>
<th>Alias</th>
<th>Media Query</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>screen-xs</code></td>
<td><code>(max-width: 544px)</code></td>
</tr>
<tr>
<td><code>screen-sm</code></td>
<td><code>(min-width: 545px) and (max-width: 768px)</code></td>
</tr>
<tr>
<td><code>screen-sm-down</code></td>
<td><code>(max-width: 768px)</code></td>
</tr>
<tr>
<td><code>screen-sm-up</code></td>
<td><code>(min-width: 545px)</code></td>
</tr>
<tr>
<td><code>screen-sm-md</code></td>
<td><code>(min-width: 545px) and (max-width: 1024px)</code></td>
</tr>
<tr>
<td><code>screen-md</code></td>
<td><code>(min-width: 769px) and (max-width: 1024px)</code></td>
</tr>
<tr>
<td><code>screen-md-down</code></td>
<td><code>(max-width: 1024px)</code></td>
</tr>
<tr>
<td><code>screen-md-up</code></td>
<td><code>(min-width: 769px)</code></td>
</tr>
<tr>
<td><code>screen-lg</code></td>
<td><code>(min-width: 1025px)</code></td>
</tr>
</tbody>
</table>
<h3 id="onquery-string-callbacks-object-string"><code>on(query: string, callbacks: Object): string</code><a class="headerlink" href="#onquery-string-callbacks-object-string" title="Permanent link">#</a></h3>
<p>Registers a set of callback functions for the provided media query, the possible
keys are <code>match</code>, <code>unmatch</code> and <code>setup</code>. The method returns a randomly generated
UUIDv4 that is used to identify these callbacks and allows them to be removed
via <code>.remove()</code>.</p>
<h3 id="removequery-string-uuid-string"><code>remove(query: string, uuid: string)</code><a class="headerlink" href="#removequery-string-uuid-string" title="Permanent link">#</a></h3>
<p>Removes all callbacks for a media query that match the UUIDv4 that was previously
obtained from the call to <code>.on()</code>.</p>
<h3 id="isquery-string-boolean"><code>is(query: string): boolean</code><a class="headerlink" href="#isquery-string-boolean" title="Permanent link">#</a></h3>
<p>Tests if the provided media query currently matches and returns true on match.</p>
<h3 id="scrolldisable"><code>scrollDisable()</code><a class="headerlink" href="#scrolldisable" title="Permanent link">#</a></h3>
<p>Temporarily prevents the page from being scrolled, until <code>.scrollEnable()</code> is
called.</p>
<h3 id="scrollenable"><code>scrollEnable()</code><a class="headerlink" href="#scrollenable" title="Permanent link">#</a></h3>
<p>Enables page scrolling again, unless another pending action has also prevented
the page scrolling.</p>
<h2 id="environment"><code>Environment</code><a class="headerlink" href="#environment" title="Permanent link">#</a></h2>
<div class="admonition warning">
<p class="admonition-title">The <code>Environment</code> module uses a mixture of feature detection and user agent sniffing to determine the browser and platform. In general, its results have proven to be very accurate, but it should be taken with a grain of salt regardless. Especially the browser checks are designed to be your last resort, please use feature detection instead whenever it is possible!</p>
</div>
<p>Sometimes it may be necessary to alter the behavior of your code depending on
the browser platform (e. g. mobile devices) or based on a specific browser in
order to work-around some quirks.</p>
<h3 id="browser-string"><code>browser(): string</code><a class="headerlink" href="#browser-string" title="Permanent link">#</a></h3>
<p>Attempts to detect browsers based on their technology and supported CSS vendor
prefixes, and although somewhat reliable for major browsers, it is highly
recommended to use feature detection instead.</p>
<p>Possible values:
 - <code>chrome</code> (includes Opera 15+ and Vivaldi)
 - <code>firefox</code>
 - <code>safari</code>
 - <code>microsoft</code> (Internet Explorer and Edge)
 - <code>other</code> (default)</p>
<h3 id="platform-string"><code>platform(): string</code><a class="headerlink" href="#platform-string" title="Permanent link">#</a></h3>
<p>Attempts to detect the browser platform using user agent sniffing.</p>
<p>Possible values:
 - <code>ios</code>
 - <code>android</code>
 - <code>windows</code> (IE Mobile)
 - <code>mobile</code> (generic mobile device)
 - <code>desktop</code> (default)</p>
                
                  
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