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  </defs>
</svg>

  <header id="site_header">
    <h1 class="text-logo"><span>&lt;</span><b>X</b><span>&gt;</span></h1>
    <nav id="global_nav" font="mono">
      <input id="global_nav_checkbox" type="checkbox" />
      <div>Menu</div>
      <a href="/"><svg><use xlink:href="#network"></use></svg>Home</a>
      <a href="/docs"><svg><use xlink:href="#docs"></use></svg>Docs</a>
      <a href="/builds"><svg><use xlink:href="#package"></use></svg>Builds</a>
      <a href="https://github.com/x-tag/core-2"><svg><use xlink:href="#fork"></use></svg>Fork</a>
    </nav>
  </header>

  <main>
    <section id="home_section">

      <h2 id="home_logo" data-version=""><div class="text-logo"><span>&lt;</span><b>X</b><span>&gt;</span></div>
      <div id="logo_version">v2.0 alpha (be warned) - for v1, click <b><a href="javascript:window.location.href='http://x-tag.github.io/v1'">here</a></b></div>
      </h2>
      <h2>X-Tag is a
      <span font="blue">lightweight, power-packed </span> 
      <span font="green">Web Components library</span> 
      that gets you there fast, and stays in its own lane.</h2>

      <hr />

      <ul class="feature-row">
        <li>
          <svg viewBox="25 15 465 465">
            <rect fill="#fff" x="27.5%" y="21%" width="55%" height="65%"></rect>
            <path d="M71.197,46l33.604,377.479L255.474,466l151.725-42.521L440.803,46H71.197z M367.82,169.11H190.905l3.929,47.519h169.058  l-13.137,142.792l-94.236,25.99v0.268h-1.045l-95.029-26.258l-5.775-72.975h45.939l3.41,36.754l51.455,13.914l51.707-13.914  l5.782-59.846H152.312l-12.335-140.176h232.047L367.82,169.11z"></path>
          </svg>
          <h2 text-shadow>Standard</h2>
          <div>Built on Web Components APIs</div>
        </li><li>
          <svg viewBox="0 0 1024 1024">
            <path d="M217.805 1001.83c15.718-50.278 39.424-121.037 71.219-223.334 138.598-21.965 195.942 17.459 283.955-139.725-71.424 21.862-157.542-40.55-152.934-67.635 4.659-27.034 200.346 19.507 328.499-162.458-161.536 35.635-213.197-42.803-192.358-54.63 48.077-27.341 190.771-11.366 266.854-85.453 39.219-38.144 57.6-130.867 41.626-163.942-19.149-39.987-135.987-99.635-200.397-94.003-64.41 5.581-165.427 245.248-195.43 243.405-29.901-1.894-35.994-107.418 16.333-205.466-55.142 24.422-156.211 100.301-187.904 165.171-59.034 120.678 5.53 397.619-15.155 407.45-20.736 9.882-90.419-127.027-111.206-189.133-28.416 95.181-29.082 190.515 53.914 317.133-31.283 83.098-48.384 178.739-50.995 227.379-1.229 38.861 37.069 47.206 43.981 25.242z"></path>
          </svg>
          <h2 text-shadow>Efficient</h2>
          <div>Powerful features in <i style="color: #eee;">3k</i> min/gzip</div>
        </li><li>
          <svg viewBox="0 0 1024 1024">
            <path d="M657.322 15.318l-187.968 187.734-81.302-81.066c-20.458-20.48-53.546-20.48-74.026 0s-20.48 53.546 0 74.026l11.52 11.52-90.88 91.094c-117.334 117.334-141.44 290.368-56.746 427.542l-153.174 153.174c-33.088 33.046-33.088 86.826 0 119.872 33.066 33.088 86.826 33.088 119.658 0l153.194-153.366c137.6 85.334 310.208 60.992 427.734-56.534l90.88-91.094 11.754 11.754c20.458 20.458 53.504 20.458 74.006 0 20.502-20.502 20.502-53.59 0-74.048l-91.968-91.968 198.634-198.614c20.502-20.48 20.502-53.546 0-74.026s-53.546-20.48-74.006 0l-198.634 198.4-192.662-192.426 187.968-187.946c20.502-20.48 20.502-53.546 0-74.026s-53.522-20.482-73.982-0.002z"></path>
          </svg>
          <h2 text-shadow>Pluggable</h2>
          <div>Plays nice with other libraries</div>
        </li>
      </ul>

      <hr/>

      <h2>What is X-Tag?</h2>

      <p>Originally developed at Mozilla, now supported by devs at Microsoft, X-Tag is an open source JavaScript library that wraps the W3C standard <a href="http://jonrimmer.github.io/are-we-componentized-yet/">Web Components</a> family of APIs
      to provide a compact, feature-rich interface for component development. While X-Tag makes it easy to leverage all the Web Components APIs
      (Custom Elements, Shadow DOM, Templates, and HTML Imports), it only requires Custom Elements API support to operate.
      In the absence of the native Custom Elements APIs, X-Tag uses the same <a target="_blank" href="https://github.com/webcomponents/custom-elements">polyfill</a>
      Google's Polymer framework relies on. You can view our package options in the <a href="/builds">Builds</a> section</p>


      <hr/>

      <x-clock></x-clock>

<pre class="language-javascript"><code>
xtag.create('x-clock', class extends XTagElement {
  connectedCallback () {
    this.start();
  }
  start (){
    this.update();
    this._interval = setInterval(() => this.update(), 1000);
  }
  stop (){
    this._interval = clearInterval(this._data.interval);
  }
  update (){
    this.textContent = new Date().toLocaleTimeString();
  }
  'tap::event' (){
    if (this._interval) this.stop();
    else this.start();
  }
});
</code></pre>

<hr/>
      
      <h2 text-shadow>Browser Support</h2>
      <div id="browser_support" class="feature-row">
        <div>
          <svg id="browser_edge" width="100%" height="1em" viewBox="0 0 399 432">
            <path fill="#ffffff" d="M80.9746094,114.404297 C29.7135331,146.31357 0.416015625,191.658203 0.416015625,191.658203 C0.416015625,191.658203 8.00793654,96.5783329 80.9746094,40.9433594 C109.99433,18.8166636 149.669408,0.278808594 203.032715,0.278808594 C223.079627,0.278808594 265.118164,3.76660156 302.984375,27.1123047 C340.850586,50.4580078 356.149414,70.0136719 373.208984,98.6445312 C380.570259,110.998865 386.565681,126.870142 390.305664,142.179688 C397.312935,170.863811 398.165039,205.168945 398.165039,205.168945 L398.165039,250.359375 L127.542969,250.359375 C127.542969,250.359375 120.933594,341.28125 245.390625,341.28125 C288.675172,341.28125 303.832031,334.481445 318.068359,330.265625 C340.35498,323.665862 361.875,308.955078 361.875,308.955078 L361.916016,399.796875 C361.916016,399.796875 310.980469,431.170898 234.030273,431.170898 C212.360573,431.170898 189.523812,429.353496 167.5,422.208008 C148.255049,415.964103 107.950758,399.1222 80.9746094,359.650391 C71.4321522,345.687758 61.0920706,327.107886 55.9707031,308.955078 C50.4340389,289.330241 50.5019531,270.265226 50.5019531,259.761719 C50.5019531,220.477429 63.9233273,182.970681 87.2128906,155.856445 C117.379883,120.735352 155.509766,105.273438 155.509766,105.273438 C155.509766,105.273438 143.089844,119.75293 135.450195,137.780273 C127.810547,155.807617 125.720703,173.945312 125.720703,173.945312 L278.529468,173.945312 C278.529468,173.945312 287.466797,82.6347656 192.064453,82.6347656 C156.11735,82.6347656 111.967456,95.111701 80.9746094,114.404297 Z"/>
          </svg>
          Edge
        </div><div>
          <svg id="browser_chrome" width="100%" height="1em" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M258.278 446.542l-146.532-253.802c93.818-117.464 238.234-192.74 400.254-192.74 187.432 0 351.31 100.736 440.532 251h-417.77c-7.504-0.65-15.092-1-22.762-1-121.874 0-224.578 83.644-253.722 196.542zM695.306 325h293.46c22.74 57.93 35.234 121.004 35.234 187 0 280.826-226.1 508.804-506.186 511.926l209.394-362.678c29.48-42.378 46.792-93.826 46.792-149.248 0-73.17-30.164-139.42-78.694-187zM326 512c0-102.56 83.44-186 186-186s186 83.44 186 186c0 102.56-83.44 186-186 186s-186-83.44-186-186zM582.182 764.442l-146.578 253.878c-246.532-36.884-435.604-249.516-435.604-506.32 0-91.218 23.884-176.846 65.696-251.024l209.030 362.054c41.868 89.112 132.476 150.97 237.274 150.97 24.3 0 47.836-3.34 70.182-9.558z"></path>
          </svg>
          Chrome <i>(desktop and mobile)</i>
        </div><div>
          <svg id="browser_firefox" width="100%" height="1em" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M1022.526 334.14l-11.86 76.080c0 0-16.954-140.856-37.732-193.514-31.846-80.688-46.014-80.040-46.108-79.922 21.33 54.204 17.462 83.324 17.462 83.324s-37.792-102.998-137.712-135.768c-110.686-36.282-170.57-26.364-177.488-24.486-1.050-0.008-2.064-0.010-3.030-0.010 0.818 0.062 1.612 0.146 2.426 0.212-0.034 0.020-0.090 0.042-0.082 0.052 0.45 0.548 122.306 21.302 143.916 50.996 0 0-51.76 0-103.272 14.842-2.328 0.666 189.524 23.964 228.746 215.674 0 0-21.030-43.876-47.040-51.328 17.106 52.036 12.714 150.776-3.576 199.85-2.096 6.312-4.24-27.282-36.328-41.75 10.28 73.646-0.616 190.456-51.708 222.632-3.982 2.504 32.030-115.31 7.242-69.762-142.708 218.802-311.404 100.972-387.248 49.11 38.866 8.462 112.654-1.318 145.314-25.612 0.042-0.030 0.078-0.056 0.118-0.086 35.468-24.252 56.472-41.964 75.334-37.772 18.874 4.214 31.438-14.726 16.78-31.53-14.676-16.838-50.314-39.978-98.524-27.366-34 8.904-76.134 46.522-140.448 8.432-49.364-29.25-54.012-53.546-54.45-70.376 1.218-5.966 2.754-11.536 4.576-16.624 5.682-15.87 22.912-20.658 32.494-24.438 16.256 2.792 30.262 7.862 44.968 15.406 0.19-4.894 0.252-11.39-0.018-18.76 1.41-2.802 0.538-11.252-1.722-21.58-1.302-10.308-3.42-20.974-6.752-30.692 0.012-0.002 0.020-0.010 0.030-0.014 0.056-0.018 0.108-0.040 0.156-0.070 0.078-0.044 0.146-0.112 0.208-0.19 0.012-0.020 0.030-0.034 0.044-0.052 0.082-0.124 0.154-0.272 0.198-0.466 1.020-4.618 12.022-13.524 25.718-23.1 12.272-8.58 26.702-17.696 38.068-24.752 10.060-6.248 17.72-10.882 19.346-12.098 0.618-0.466 1.358-1.012 2.164-1.636 0.15-0.116 0.3-0.232 0.454-0.354 0.094-0.074 0.19-0.148 0.286-0.226 5.41-4.308 13.484-12.448 15.178-29.578 0.004-0.042 0.010-0.080 0.012-0.122 0.050-0.504 0.092-1.014 0.13-1.534 0.028-0.362 0.050-0.726 0.072-1.096 0.014-0.284 0.032-0.566 0.044-0.856 0.030-0.674 0.050-1.364 0.060-2.064 0-0.040 0.002-0.076 0.004-0.116 0.022-1.658-0.006-3.386-0.104-5.202-0.054-1.014-0.126-1.93-0.298-2.762-0.008-0.044-0.018-0.092-0.028-0.136-0.018-0.082-0.036-0.164-0.058-0.244-0.036-0.146-0.076-0.292-0.122-0.43-0.006-0.018-0.010-0.032-0.016-0.046-0.052-0.16-0.112-0.314-0.174-0.464-0.004-0.006-0.004-0.010-0.006-0.016-1.754-4.108-8.32-5.658-35.442-6.118-0.026-0.002-0.050-0.002-0.076-0.002v0c-11.066-0.188-25.538-0.194-44.502-0.118-33.25 0.134-51.628-32.504-57.494-45.132 8.040-44.46 31.276-76.142 69.45-97.626 0.722-0.406 0.58-0.742-0.274-0.978 7.464-4.514-90.246-0.124-135.186 57.036-39.888-9.914-74.654-9.246-104.616-2.214-5.754-0.162-12.924-0.88-21.434-2.652-19.924-18.056-48.448-51.402-49.976-91.208 0 0-0.092 0.072-0.252 0.204-0.020-0.382-0.056-0.76-0.072-1.142 0 0-60.716 46.664-51.628 173.882-0.022 2.036-0.064 3.986-0.12 5.874-16.432 22.288-24.586 41.020-25.192 45.156-14.56 29.644-29.334 74.254-41.356 141.98 0 0 8.408-26.666 25.284-56.866-12.412 38.022-22.164 97.156-16.436 185.856 0 0 1.514-19.666 6.874-47.994 4.186 55.010 22.518 122.924 68.858 202.788 88.948 153.32 225.67 230.74 376.792 242.616 26.836 2.212 54.050 2.264 81.424 0.186 2.516-0.178 5.032-0.364 7.55-0.574 30.964-2.174 62.134-6.852 93.238-14.366 425.172-102.798 378.942-616.198 378.942-616.198z"></path>
          </svg>
          Firefox <i>(desktop and mobile)</i>
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    </section>

    <section id="builds_section">

      <div class="section-intro">

      <h2>Install from NPM:</h2>
      <p><code>npm install x-tag</code></p>

    </div>

    <hr />

    <div class="section-intro">
      <h2>Download the build that works best for you:</h2>
    </div>

    <menu id="build_features" class="feature-row">
      <a href="https://rawgit.com/x-tag/core/master/dist/x-tag-polyfilled.min.js" download="x-tag-polyfilled.min.js">
        <svg><use xlink:href="#open_box"></use></svg>
        <h2 text-shadow>X-Tag<br/>+<br/>Polyfills<br/></h2>
        <div>X-Tag + Custom Elements polyfill</br><i style="color: #eee;">6k min/gzip</i></div>
      </a>
      <a href="https://rawgit.com/x-tag/core/master/dist/x-tag-raw.min.js" download="x-tag-raw.min.js">
        <svg><use xlink:href="#open_box"></use></svg>
        <h2 text-shadow>Just X-Tag<br/>•<br/>No Polyfills</h2>
        <div>Run it raw on native APIs</br><i style="color: #eee;">3k min/gzip</i></div>
      </a>
    </menu>
    </section>

    <section id="docs_section">

      
<h2 id="getting_started">Getting Started</h2>

  <p>
    The most important method in the X-Tag library is <code>xtag.create()</code>. The <code>create</code> function on the X-Tag object is what you'll use
    to create new custom element definitions, which can include things like lifecycle callbacks, attribute-linked getters/setters (accessors),
    and event listeners. Here's what defining a simple custom element looks like with X-Tag:
  </p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  constructor (){
    alert("It's moving...it's alive!");
  }
});
</code></pre>

  <p>
    Notice the </code>class</code> definition extends the class <code>XTagElement</code>. If you are not extending from a previously defined Custom Element, 
    you must always extend from the <code>XTagElement</code> class for X-Tag to properly construct your Custom Element definition. The tag name argument (and subsequent automatic 
    element registration) is optional - here's what it looks like without it, and how to register your element with a tag name separately:
  </p>

<pre class="language-javascript"><code>
const Frank = xtag.create(class extends XTagElement {
  constructor (){
    alert("Muhahaha!");
  }
});

xtag.register('x-frankenstein', Frank);
</code></pre>

<hr/>

<h3>A Word on Extensions and Pseudos</h3>

<p>
  In the next sections you're going to hear about a few features that are delivered via two different types of modular extensibility systems the 
  library offers for imbuing your elements with advanced functionality. These two systems are called <code>extensions</code> and <code>pseudos</code>. 
  Both are different in their intent, scope of effect, range of capabilities. You will use them frequently in your Custom Element class definition 
  blocks, here's what they look like:
</p>

<pre class="language-javascript"><code>
xtag.create('x-foo', class extends XTagElement {
  'alert::foo' (){

  }
  'count:bar' (){

  }
  'send::attr:bar:zaz' (){
    
  }
});
</code></pre>

<p>
  Notice how the alert method has a <code>::foo</code> attached to it - this is an extension. Extensions are little modules you can created that are called 
  into service by tagging a property with <code>::</code> + the name of the extension. Extensions are a sizable API of their own that let's you manipulate 
  far more than just the property they are tagged to. You can only use one extension per property.
</p>

<p>
  The other API for adding custom functionality to components is called pseudos, which are seen above in the example property <code>count:bar</code>. When a pseudo is tagged to a property, the pseudo's 
  own function wraps the target function so that the pseudo is executed first, then the target, which receives its return value. You can chain pseudos, and 
  they are compiled from left to right so that they left most pseudo function wrapper fires first, passing each function's return value down to the next, until 
  finally the original target function is executed. You can see what this looks like in the above example property <code>send::foo:bar:zaz</code>.
<p>

</p>
  There are separate guides for extensions and pseudos that talk about how to create and use your own, but for now just be aware that they are one of 
  the primary means the X-Tag library delivers its own features.
</p>

<hr/>


<h3>Content is King</h3>

  <p>
    Many of the components you create will require child elements for structure and presentation. X-Tag includes a content templating
    <code>extension</code> that makes this quick and easy. Simply add a <code>::template</code> function to your component definition 
    and return a string or ES6 Template String. In the example below, notice the <code>true</code> parameter being passed to the extension. 
    This tells the template extension to render the content immediately when an instance is created. If you don't want a template to render 
    automatically like this, don't pass anything to it.
  </p>

<pre class="language-javascript"><code>
xtag.create('x-frankenstein', class extends XTagElement {
  '::template(true)' (){
    return `&lt;h2&gt;I am Frankenstein&lt;/h2&gt;
            &lt;span&gt;I was created by a mad scientist&lt;/span&gt;`
  }
});
</code></pre>

<h4>Manual Rendering of Templates</h4>

<p>
  If you elect not to have your template automatically rendered when your component instances are created, you'll need to manually trigger render.
</p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  '::template' (){
    return `&lt;h2&gt;I am Frankenstein&lt;/h2&gt;
            &lt;span&gt;I was created by a mad scientist&lt;/span&gt;`
  }
});

const FrankNode = new Frank();
FrankNode.render();
</code></pre>

<h4>Multiple Templates</h4>

<p>
  The template extension can be used multiple times within the same class definition block, which allows you to specify different templates 
  for use in the same component. The templates are cached and reference based on the property name you put in front of the <code>::template</code> extension 
  token. To render your templates, simply pass the name of the template you want to use to the <code>render</code> function, as in the following example:
</p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  'foo::template(true)' (){
    return `&lt;h2&gt;My name is Frankenstein&lt;/h2&gt;
            &lt;span&gt;I work for a mad scientist&lt;/span&gt;`
  }
  'bar::template' (){
    return `&lt;h2&gt;My friends call me Frank&lt;/h2&gt;
            &lt;span&gt;I work for a mad scientist&lt;/span&gt;`
  }
});

const FrankNode = new Frank();
// Because the foo template indicated it was to be automatically rendered, its content is already present in your element instance.
FrankNode.render('bar');
// Calling the render function with the bar template name swaps out the current foo template content with the bar content.
</code></pre>

<hr/>

  <h3>Say Hello to Custom Attribute Accessors</h3>

    <p>
      Accessors are custom attributes linking to a corresponding pair of setters/getters, and X-Tag has a built-in extension that makes adding accessors to 
      your custom element definition stupid simple. To use this extension, add an <code>::attr</code> modifier to one of your class definition properties. 
      This tells X-Tag to wire up a getter/setter to an HTML attribute of the same name. When attributes are linked to a getter/setter their gets, sets, and 
      state changes will be synced without having to write any additional code.
    </p>

    <p>
      You can also tell the accessor extension that type of accessor you are creating, and it will help by sanitizing values and modifying the gets/sets to 
      match the behavior of the type you declare. I

<pre class="language-javascript"><code>
xtag.create('x-foo', new class extends XTagElement {
  set 'maxVolume::attr' (value){
    // X-Tag automatically maps camel cased getter/setter names to their
    // dashed attribute equivalents. In this example, the `maxVolume` 
    // getter/setter pair maps to the `max-volume` attribute.
  }
});

xtag.create('x-bar', new class extends XTagElement {
  '::template(true)' (){ return '&lt;input /&gt;' }
  set 'disabled::attr(boolean)' (value){
    // The ::attr extended property links node.disabled to gets/sets of 
    // the disabled="" attribute. Because it is declared as a boolean, 
    // all values passed into its getter/setter will be a Boolean.
    this.firstElementChild.disabled = value;
  }
});
</code></pre>

<hr/>

<h3>The DL on Events</h3>
<p>
  X-Tag provides a powerful event system you'll use often in developing your components.
  We'll cover the basics here, and leave the more advanced features for a special tutorial dedicated to the topic.
</p>

<p>
  To add event listeners to your component (either native or custom events), you'll be using the <code>event</code> extension. To do so, add a property to your 
  Custom Element definition that matches the name of the event you want to listen for, plus the <code>::event</code> extension flag. When your class definition 
  is processed by X-Tag's create method, the <code>event</code> extension will remove the property, add a listener using the supplied property name with the 
  function you supplied as the handler.
</p>

<pre class="language-javascript"><code>
xtag.register('x-foo', {
  'click::event': function(){
    // attaches a click listener that calls this function when
    // the user clicks an element inside the custom element
  },
  'focus::event': function(){
    // attaches a focus listener that calls this function when
    // something inside your custom element is focused.
  }
});
</code></pre>

<hr/>

<h3>Gettin' Jedi with Pseudos</h3>

<p>
  One advanced feature of X-Tag you should be aware of right off the bat is the <code>delegate</code> pseudo.
  X-Tag features a function modifier system called <code>pseudos</code> which allows you to seamlessly wrap
  functions anywhere in your custom element defintion object (lifecycle callbacks, methods, accessors, and events)
  to extend their functionality. The <code>delegate</code> pseudo enables you to quickly add event delegation
  (filtering of event targets based on CSS expressions) to any event function you add to your component. Here's an example:</p>

<pre class="language-javascript"><code>
xtag.register('x-foo', {
  content: '&lt;input/&gt;',
  events: {
    'tap:delegate(input)': function(){
      // Perform an action only when the user taps on an
      // &lt;input/&gt; element within your component.
    }
  }
});
</code></pre>

<h4>Create your own Pseudo:</h4>

<p>
  Once you create a pseudo and add it to the main xtag.pseudos object, as show below,
  you can then use it on any key of your custom element defintion objects that has a
  function as its value.
</p>

<pre class="language-javascript"><code>
xtag.pseudos.example = {
  onAdd: function(){
    /*
      This function is fired once when the base function is added to
      the target object. For instance:

      If you added an event with xtag.addEvent(someNode, 'tap:example', fn),
      the onAdd function of the 'example' pseudo would be fired once when
      the event is first attached to the element 'someNode'.
    */

  },
  onRemove: function(){
    /*
      This is basically the opposite of the onAdd function above.
      With onRemove, you can clean up whatever you may have done
      in your onAdd or action function invocations.
    */
  },
  action: function(pseudo, event) {
    /*
      This function is fired each time the pseudo chain is fired.
      Pseudo actions are fired in the order they are chained, meaning
      the in the pseudo 'toggle:log:example', the action function
      for the 'log' pseudo would fire first, then the 'example' action
      and finally the base function 'toggle' they are chained to.
    */
  }
};
</code></pre>
<commit_msg>Update to pseudos documentation<commit_after><!DOCTYPE html>
<html lang="en">

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      <h2 id="home_logo" data-version=""><div class="text-logo"><span>&lt;</span><b>X</b><span>&gt;</span></div>
      <div id="logo_version">v2.0 alpha (be warned) - for v1, click <b><a href="javascript:window.location.href='http://x-tag.github.io/v1'">here</a></b></div>
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      <h2>X-Tag is a
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      that gets you there fast, and stays in its own lane.</h2>

      <hr />

      <ul class="feature-row">
        <li>
          <svg viewBox="25 15 465 465">
            <rect fill="#fff" x="27.5%" y="21%" width="55%" height="65%"></rect>
            <path d="M71.197,46l33.604,377.479L255.474,466l151.725-42.521L440.803,46H71.197z M367.82,169.11H190.905l3.929,47.519h169.058  l-13.137,142.792l-94.236,25.99v0.268h-1.045l-95.029-26.258l-5.775-72.975h45.939l3.41,36.754l51.455,13.914l51.707-13.914  l5.782-59.846H152.312l-12.335-140.176h232.047L367.82,169.11z"></path>
          </svg>
          <h2 text-shadow>Standard</h2>
          <div>Built on Web Components APIs</div>
        </li><li>
          <svg viewBox="0 0 1024 1024">
            <path d="M217.805 1001.83c15.718-50.278 39.424-121.037 71.219-223.334 138.598-21.965 195.942 17.459 283.955-139.725-71.424 21.862-157.542-40.55-152.934-67.635 4.659-27.034 200.346 19.507 328.499-162.458-161.536 35.635-213.197-42.803-192.358-54.63 48.077-27.341 190.771-11.366 266.854-85.453 39.219-38.144 57.6-130.867 41.626-163.942-19.149-39.987-135.987-99.635-200.397-94.003-64.41 5.581-165.427 245.248-195.43 243.405-29.901-1.894-35.994-107.418 16.333-205.466-55.142 24.422-156.211 100.301-187.904 165.171-59.034 120.678 5.53 397.619-15.155 407.45-20.736 9.882-90.419-127.027-111.206-189.133-28.416 95.181-29.082 190.515 53.914 317.133-31.283 83.098-48.384 178.739-50.995 227.379-1.229 38.861 37.069 47.206 43.981 25.242z"></path>
          </svg>
          <h2 text-shadow>Efficient</h2>
          <div>Powerful features in <i style="color: #eee;">3k</i> min/gzip</div>
        </li><li>
          <svg viewBox="0 0 1024 1024">
            <path d="M657.322 15.318l-187.968 187.734-81.302-81.066c-20.458-20.48-53.546-20.48-74.026 0s-20.48 53.546 0 74.026l11.52 11.52-90.88 91.094c-117.334 117.334-141.44 290.368-56.746 427.542l-153.174 153.174c-33.088 33.046-33.088 86.826 0 119.872 33.066 33.088 86.826 33.088 119.658 0l153.194-153.366c137.6 85.334 310.208 60.992 427.734-56.534l90.88-91.094 11.754 11.754c20.458 20.458 53.504 20.458 74.006 0 20.502-20.502 20.502-53.59 0-74.048l-91.968-91.968 198.634-198.614c20.502-20.48 20.502-53.546 0-74.026s-53.546-20.48-74.006 0l-198.634 198.4-192.662-192.426 187.968-187.946c20.502-20.48 20.502-53.546 0-74.026s-53.522-20.482-73.982-0.002z"></path>
          </svg>
          <h2 text-shadow>Pluggable</h2>
          <div>Plays nice with other libraries</div>
        </li>
      </ul>

      <hr/>

      <h2>What is X-Tag?</h2>

      <p>Originally developed at Mozilla, now supported by devs at Microsoft, X-Tag is an open source JavaScript library that wraps the W3C standard <a href="http://jonrimmer.github.io/are-we-componentized-yet/">Web Components</a> family of APIs
      to provide a compact, feature-rich interface for component development. While X-Tag makes it easy to leverage all the Web Components APIs
      (Custom Elements, Shadow DOM, Templates, and HTML Imports), it only requires Custom Elements API support to operate.
      In the absence of the native Custom Elements APIs, X-Tag uses the same <a target="_blank" href="https://github.com/webcomponents/custom-elements">polyfill</a>
      Google's Polymer framework relies on. You can view our package options in the <a href="/builds">Builds</a> section</p>


      <hr/>

      <x-clock></x-clock>

<pre class="language-javascript"><code>
xtag.create('x-clock', class extends XTagElement {
  connectedCallback () {
    this.start();
  }
  start (){
    this.update();
    this._interval = setInterval(() => this.update(), 1000);
  }
  stop (){
    this._interval = clearInterval(this._data.interval);
  }
  update (){
    this.textContent = new Date().toLocaleTimeString();
  }
  'tap::event' (){
    if (this._interval) this.stop();
    else this.start();
  }
});
</code></pre>

<hr/>
      
      <h2 text-shadow>Browser Support</h2>
      <div id="browser_support" class="feature-row">
        <div>
          <svg id="browser_edge" width="100%" height="1em" viewBox="0 0 399 432">
            <path fill="#ffffff" d="M80.9746094,114.404297 C29.7135331,146.31357 0.416015625,191.658203 0.416015625,191.658203 C0.416015625,191.658203 8.00793654,96.5783329 80.9746094,40.9433594 C109.99433,18.8166636 149.669408,0.278808594 203.032715,0.278808594 C223.079627,0.278808594 265.118164,3.76660156 302.984375,27.1123047 C340.850586,50.4580078 356.149414,70.0136719 373.208984,98.6445312 C380.570259,110.998865 386.565681,126.870142 390.305664,142.179688 C397.312935,170.863811 398.165039,205.168945 398.165039,205.168945 L398.165039,250.359375 L127.542969,250.359375 C127.542969,250.359375 120.933594,341.28125 245.390625,341.28125 C288.675172,341.28125 303.832031,334.481445 318.068359,330.265625 C340.35498,323.665862 361.875,308.955078 361.875,308.955078 L361.916016,399.796875 C361.916016,399.796875 310.980469,431.170898 234.030273,431.170898 C212.360573,431.170898 189.523812,429.353496 167.5,422.208008 C148.255049,415.964103 107.950758,399.1222 80.9746094,359.650391 C71.4321522,345.687758 61.0920706,327.107886 55.9707031,308.955078 C50.4340389,289.330241 50.5019531,270.265226 50.5019531,259.761719 C50.5019531,220.477429 63.9233273,182.970681 87.2128906,155.856445 C117.379883,120.735352 155.509766,105.273438 155.509766,105.273438 C155.509766,105.273438 143.089844,119.75293 135.450195,137.780273 C127.810547,155.807617 125.720703,173.945312 125.720703,173.945312 L278.529468,173.945312 C278.529468,173.945312 287.466797,82.6347656 192.064453,82.6347656 C156.11735,82.6347656 111.967456,95.111701 80.9746094,114.404297 Z"/>
          </svg>
          Edge
        </div><div>
          <svg id="browser_chrome" width="100%" height="1em" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M258.278 446.542l-146.532-253.802c93.818-117.464 238.234-192.74 400.254-192.74 187.432 0 351.31 100.736 440.532 251h-417.77c-7.504-0.65-15.092-1-22.762-1-121.874 0-224.578 83.644-253.722 196.542zM695.306 325h293.46c22.74 57.93 35.234 121.004 35.234 187 0 280.826-226.1 508.804-506.186 511.926l209.394-362.678c29.48-42.378 46.792-93.826 46.792-149.248 0-73.17-30.164-139.42-78.694-187zM326 512c0-102.56 83.44-186 186-186s186 83.44 186 186c0 102.56-83.44 186-186 186s-186-83.44-186-186zM582.182 764.442l-146.578 253.878c-246.532-36.884-435.604-249.516-435.604-506.32 0-91.218 23.884-176.846 65.696-251.024l209.030 362.054c41.868 89.112 132.476 150.97 237.274 150.97 24.3 0 47.836-3.34 70.182-9.558z"></path>
          </svg>
          Chrome <i>(desktop and mobile)</i>
        </div><div>
          <svg id="browser_firefox" width="100%" height="1em" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M1022.526 334.14l-11.86 76.080c0 0-16.954-140.856-37.732-193.514-31.846-80.688-46.014-80.040-46.108-79.922 21.33 54.204 17.462 83.324 17.462 83.324s-37.792-102.998-137.712-135.768c-110.686-36.282-170.57-26.364-177.488-24.486-1.050-0.008-2.064-0.010-3.030-0.010 0.818 0.062 1.612 0.146 2.426 0.212-0.034 0.020-0.090 0.042-0.082 0.052 0.45 0.548 122.306 21.302 143.916 50.996 0 0-51.76 0-103.272 14.842-2.328 0.666 189.524 23.964 228.746 215.674 0 0-21.030-43.876-47.040-51.328 17.106 52.036 12.714 150.776-3.576 199.85-2.096 6.312-4.24-27.282-36.328-41.75 10.28 73.646-0.616 190.456-51.708 222.632-3.982 2.504 32.030-115.31 7.242-69.762-142.708 218.802-311.404 100.972-387.248 49.11 38.866 8.462 112.654-1.318 145.314-25.612 0.042-0.030 0.078-0.056 0.118-0.086 35.468-24.252 56.472-41.964 75.334-37.772 18.874 4.214 31.438-14.726 16.78-31.53-14.676-16.838-50.314-39.978-98.524-27.366-34 8.904-76.134 46.522-140.448 8.432-49.364-29.25-54.012-53.546-54.45-70.376 1.218-5.966 2.754-11.536 4.576-16.624 5.682-15.87 22.912-20.658 32.494-24.438 16.256 2.792 30.262 7.862 44.968 15.406 0.19-4.894 0.252-11.39-0.018-18.76 1.41-2.802 0.538-11.252-1.722-21.58-1.302-10.308-3.42-20.974-6.752-30.692 0.012-0.002 0.020-0.010 0.030-0.014 0.056-0.018 0.108-0.040 0.156-0.070 0.078-0.044 0.146-0.112 0.208-0.19 0.012-0.020 0.030-0.034 0.044-0.052 0.082-0.124 0.154-0.272 0.198-0.466 1.020-4.618 12.022-13.524 25.718-23.1 12.272-8.58 26.702-17.696 38.068-24.752 10.060-6.248 17.72-10.882 19.346-12.098 0.618-0.466 1.358-1.012 2.164-1.636 0.15-0.116 0.3-0.232 0.454-0.354 0.094-0.074 0.19-0.148 0.286-0.226 5.41-4.308 13.484-12.448 15.178-29.578 0.004-0.042 0.010-0.080 0.012-0.122 0.050-0.504 0.092-1.014 0.13-1.534 0.028-0.362 0.050-0.726 0.072-1.096 0.014-0.284 0.032-0.566 0.044-0.856 0.030-0.674 0.050-1.364 0.060-2.064 0-0.040 0.002-0.076 0.004-0.116 0.022-1.658-0.006-3.386-0.104-5.202-0.054-1.014-0.126-1.93-0.298-2.762-0.008-0.044-0.018-0.092-0.028-0.136-0.018-0.082-0.036-0.164-0.058-0.244-0.036-0.146-0.076-0.292-0.122-0.43-0.006-0.018-0.010-0.032-0.016-0.046-0.052-0.16-0.112-0.314-0.174-0.464-0.004-0.006-0.004-0.010-0.006-0.016-1.754-4.108-8.32-5.658-35.442-6.118-0.026-0.002-0.050-0.002-0.076-0.002v0c-11.066-0.188-25.538-0.194-44.502-0.118-33.25 0.134-51.628-32.504-57.494-45.132 8.040-44.46 31.276-76.142 69.45-97.626 0.722-0.406 0.58-0.742-0.274-0.978 7.464-4.514-90.246-0.124-135.186 57.036-39.888-9.914-74.654-9.246-104.616-2.214-5.754-0.162-12.924-0.88-21.434-2.652-19.924-18.056-48.448-51.402-49.976-91.208 0 0-0.092 0.072-0.252 0.204-0.020-0.382-0.056-0.76-0.072-1.142 0 0-60.716 46.664-51.628 173.882-0.022 2.036-0.064 3.986-0.12 5.874-16.432 22.288-24.586 41.020-25.192 45.156-14.56 29.644-29.334 74.254-41.356 141.98 0 0 8.408-26.666 25.284-56.866-12.412 38.022-22.164 97.156-16.436 185.856 0 0 1.514-19.666 6.874-47.994 4.186 55.010 22.518 122.924 68.858 202.788 88.948 153.32 225.67 230.74 376.792 242.616 26.836 2.212 54.050 2.264 81.424 0.186 2.516-0.178 5.032-0.364 7.55-0.574 30.964-2.174 62.134-6.852 93.238-14.366 425.172-102.798 378.942-616.198 378.942-616.198z"></path>
          </svg>
          Firefox <i>(desktop and mobile)</i>
        </div><div>
          <svg id="browser_safari" width="100%" height="1em" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M512 64c-24.064 0-47.708 1.792-70.824 5.212-0.3-0.782-0.624-1.548-0.982-2.296 12.826-10.002 19.55-23.83 16.634-37.552-3.734-17.564-22.394-29.364-46.434-29.364-5.18 0-10.458 0.562-15.68 1.672-30.168 6.414-50.146 28.622-45.482 50.562 2.834 13.338 14.292 23.338 30.164 27.384-0.032 0.972-0.016 1.95 0.042 2.934-200.622 57.53-347.438 242.338-347.438 461.448 0 265.098 214.904 480 480 480 265.098 0 480-214.902 480-480 0-265.096-214.902-480-480-480zM364.882 48.908c-2.706-12.726 12.48-27.19 33.158-31.584 4.132-0.878 8.29-1.324 12.354-1.324 16.036 0 28.694 6.864 30.784 16.69 1.596 7.51-3.070 15.61-11.386 21.904-7.034-4.966-16.016-7.126-25.1-5.196-9.044 1.922-16.348 7.508-20.758 14.856-10.184-2.45-17.508-8.084-19.052-15.346zM769.386 801.386c-43.968 43.968-97.21 75.278-155.31 92.154l-42.396-68.768-10.746 79.958c-16.090 2.152-32.426 3.27-48.934 3.27-97.228 0-188.636-37.864-257.386-106.614-43.968-43.966-75.278-97.21-92.154-155.308l68.768-42.398-79.96-10.746c-2.15-16.090-3.268-32.426-3.268-48.934 0-97.228 37.862-188.636 106.614-257.386 43.968-43.968 97.212-75.278 155.31-92.156l42.396 68.77 10.748-79.96c16.088-2.15 32.424-3.268 48.932-3.268 97.228 0 188.636 37.862 257.386 106.614 43.968 43.968 75.278 97.212 92.154 155.31l-68.77 42.398 79.96 10.746c2.152 16.088 3.27 32.424 3.27 48.932 0 97.228-37.864 188.636-106.614 257.386zM760.902 295.098l-196.978 149.704c-14.644-7.658-30.876-12.062-47.416-12.726l-51.080-107.18-3.068 118.664c-13.284 6.536-25.104 15.664-34.876 26.95l-63.088-22.364 46.092 48.538c-6.334 13.518-9.866 28.030-10.434 42.824l-107.158 51.066 118.738 3.068c0.38 0.768 0.774 1.526 1.17 2.282l-149.704 196.98 196.978-149.704c14.644 7.656 30.874 12.060 47.416 12.724l51.080 107.182 3.066-118.664c13.286-6.538 25.106-15.664 34.878-26.952l63.090 22.368-46.094-48.54c6.336-13.52 9.868-28.030 10.436-42.824l107.156-51.066-118.736-3.070c-0.378-0.766-0.774-1.524-1.17-2.28l149.702-196.98zM512.102 444.534v0zM492.042 450.098c6.726-1.43 13.444-2.118 20.056-2.118 4.144 0 8.25 0.27 12.294 0.796l0.092 0.032-0.010-0.022c8.732 1.144 17.176 3.5 25.132 6.896l-71.546 54.376-54.38 71.552c-2.376-5.594-4.27-11.484-5.58-17.652-11.026-51.86 22.080-102.836 73.942-113.86zM562.12 625.884v0 0c-9.056 5.544-19.182 9.684-30.16 12.018-6.726 1.43-13.444 2.118-20.054 2.118-4.15 0-8.258-0.272-12.308-0.798l-0.068-0.010c-8.734-1.142-17.174-3.5-25.132-6.894l71.544-54.376 54.38-71.554c2.376 5.594 4.27 11.486 5.58 17.654 8.69 40.882-10.056 81.2-43.782 101.842z"></path>
          </svg>
          Safari <i>(Mac and iOS)</i>
        </div><div>
          <svg id="browser_opera" width="100%" height="1em" viewBox="0 0 1024 1024">
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          </svg>
          Opera <i>(desktop and mobile)</i>
        </div><div>
            <svg id="browser_android" width="100%" height="1em" viewBox="0 0 24 24">
              <path fill="#ffffff" d="M15 5.016v-1.031h-0.984v1.031h0.984zM9.984 5.016v-1.031h-0.984v1.031h0.984zM15.516 2.156c1.5 1.078 2.484 2.859 2.484 4.828h-12c0-1.969 0.938-3.75 2.438-4.828l-1.313-1.313c-0.188-0.188-0.188-0.516 0-0.703s0.516-0.188 0.703 0l1.5 1.5c0.797-0.422 1.734-0.656 2.672-0.656s1.828 0.234 2.625 0.656l1.5-1.5c0.188-0.188 0.516-0.188 0.703 0s0.188 0.516 0 0.703zM20.484 8.016c0.844 0 1.5 0.656 1.5 1.5v6.984c0 0.844-0.656 1.5-1.5 1.5s-1.5-0.656-1.5-1.5v-6.984c0-0.844 0.656-1.5 1.5-1.5zM3.516 8.016c0.844 0 1.5 0.656 1.5 1.5v6.984c0 0.844-0.656 1.5-1.5 1.5s-1.5-0.656-1.5-1.5v-6.984c0-0.844 0.656-1.5 1.5-1.5zM6 18v-9.984h12v9.984c0 0.563-0.422 0.984-0.984 0.984h-1.031v3.516c0 0.844-0.656 1.5-1.5 1.5s-1.5-0.656-1.5-1.5v-3.516h-1.969v3.516c0 0.844-0.656 1.5-1.5 1.5s-1.5-0.656-1.5-1.5v-3.516h-1.031c-0.563 0-0.984-0.422-0.984-0.984z"></path>
            </svg>
            Android Browser <i>(OS version 5+)</i>
          </div>
      </div>

    </section>

    <section id="builds_section">

      <div class="section-intro">

      <h2>Install from NPM:</h2>
      <p><code>npm install x-tag</code></p>

    </div>

    <hr />

    <div class="section-intro">
      <h2>Download the build that works best for you:</h2>
    </div>

    <menu id="build_features" class="feature-row">
      <a href="https://rawgit.com/x-tag/core/master/dist/x-tag-polyfilled.min.js" download="x-tag-polyfilled.min.js">
        <svg><use xlink:href="#open_box"></use></svg>
        <h2 text-shadow>X-Tag<br/>+<br/>Polyfills<br/></h2>
        <div>X-Tag + Custom Elements polyfill</br><i style="color: #eee;">6k min/gzip</i></div>
      </a>
      <a href="https://rawgit.com/x-tag/core/master/dist/x-tag-raw.min.js" download="x-tag-raw.min.js">
        <svg><use xlink:href="#open_box"></use></svg>
        <h2 text-shadow>Just X-Tag<br/>•<br/>No Polyfills</h2>
        <div>Run it raw on native APIs</br><i style="color: #eee;">3k min/gzip</i></div>
      </a>
    </menu>
    </section>

    <section id="docs_section">

      
<h2 id="getting_started">Getting Started</h2>

  <p>
    The most important method in the X-Tag library is <code>xtag.create()</code>. The <code>create</code> function on the X-Tag object is what you'll use
    to create new custom element definitions, which can include things like lifecycle callbacks, attribute-linked getters/setters (accessors),
    and event listeners. Here's what defining a simple custom element looks like with X-Tag:
  </p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  constructor (){
    alert("It's moving...it's alive!");
  }
});
</code></pre>

  <p>
    Notice the </code>class</code> definition extends the class <code>XTagElement</code>. If you are not extending from a previously defined Custom Element, 
    you must always extend from the <code>XTagElement</code> class for X-Tag to properly construct your Custom Element definition. The tag name argument (and subsequent automatic 
    element registration) is optional - here's what it looks like without it, and how to register your element with a tag name separately:
  </p>

<pre class="language-javascript"><code>
const Frank = xtag.create(class extends XTagElement {
  constructor (){
    alert("Muhahaha!");
  }
});

xtag.register('x-frankenstein', Frank);
</code></pre>

<hr/>

<h3>A Word on Extensions and Pseudos</h3>

<p>
  In the next sections you're going to hear about a few features that are delivered via two different types of modular extensibility systems the 
  library offers for imbuing your elements with advanced functionality. These two systems are called <code>extensions</code> and <code>pseudos</code>. 
  Both are different in their intent, scope of effect, range of capabilities. You will use them frequently in your Custom Element class definition 
  blocks, here's what they look like:
</p>

<pre class="language-javascript"><code>
xtag.create('x-foo', class extends XTagElement {
  'alert::foo' (){

  }
  'count:bar' (){

  }
  'send::attr:bar:zaz' (){
    
  }
});
</code></pre>

<p>
  Notice how the alert method has a <code>::foo</code> attached to it - this is an extension. Extensions are little modules you can created that are called 
  into service by tagging a property with <code>::</code> + the name of the extension. Extensions are a sizable API of their own that let's you manipulate 
  far more than just the property they are tagged to. You can only use one extension per property.
</p>

<p>
  The other API for adding custom functionality to components is called pseudos, which are seen above in the example property <code>count:bar</code>. When a pseudo is tagged to a property, the pseudo's 
  own function wraps the target function so that the pseudo is executed first, then the target, which receives its return value. You can chain pseudos, and 
  they are compiled from left to right so that they left most pseudo function wrapper fires first, passing each function's return value down to the next, until 
  finally the original target function is executed. You can see what this looks like in the above example property <code>send::foo:bar:zaz</code>.
<p>

</p>
  There are separate guides for extensions and pseudos that talk about how to create and use your own, but for now just be aware that they are one of 
  the primary means the X-Tag library delivers its own features.
</p>

<hr/>


<h3>Content is King</h3>

  <p>
    Many of the components you create will require child elements for structure and presentation. X-Tag includes a content templating
    <code>extension</code> that makes this quick and easy. Simply add a <code>::template</code> function to your component definition 
    and return a string or ES6 Template String. In the example below, notice the <code>true</code> parameter being passed to the extension. 
    This tells the template extension to render the content immediately when an instance is created. If you don't want a template to render 
    automatically like this, don't pass anything to it.
  </p>

<pre class="language-javascript"><code>
xtag.create('x-frankenstein', class extends XTagElement {
  '::template(true)' (){
    return `&lt;h2&gt;I am Frankenstein&lt;/h2&gt;
            &lt;span&gt;I was created by a mad scientist&lt;/span&gt;`
  }
});
</code></pre>

<h4>Manual Rendering of Templates</h4>

<p>
  If you elect not to have your template automatically rendered when your component instances are created, you'll need to manually trigger render.
</p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  '::template' (){
    return `&lt;h2&gt;I am Frankenstein&lt;/h2&gt;
            &lt;span&gt;I was created by a mad scientist&lt;/span&gt;`
  }
});

const FrankNode = new Frank();
FrankNode.render();
</code></pre>

<h4>Multiple Templates</h4>

<p>
  The template extension can be used multiple times within the same class definition block, which allows you to specify different templates 
  for use in the same component. The templates are cached and reference based on the property name you put in front of the <code>::template</code> extension 
  token. To render your templates, simply pass the name of the template you want to use to the <code>render</code> function, as in the following example:
</p>

<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
  'foo::template(true)' (){
    return `&lt;h2&gt;My name is Frankenstein&lt;/h2&gt;
            &lt;span&gt;I work for a mad scientist&lt;/span&gt;`
  }
  'bar::template' (){
    return `&lt;h2&gt;My friends call me Frank&lt;/h2&gt;
            &lt;span&gt;I work for a mad scientist&lt;/span&gt;`
  }
});

const FrankNode = new Frank();
// Because the foo template indicated it was to be automatically rendered, its content is already present in your element instance.
FrankNode.render('bar');
// Calling the render function with the bar template name swaps out the current foo template content with the bar content.
</code></pre>

<hr/>

  <h3>Say Hello to Custom Attribute Accessors</h3>

    <p>
      Accessors are custom attributes linking to a corresponding pair of setters/getters, and X-Tag has a built-in extension that makes adding accessors to 
      your custom element definition stupid simple. To use this extension, add an <code>::attr</code> modifier to one of your class definition properties. 
      This tells X-Tag to wire up a getter/setter to an HTML attribute of the same name. When attributes are linked to a getter/setter their gets, sets, and 
      state changes will be synced without having to write any additional code.
    </p>

    <p>
      You can also tell the accessor extension that type of accessor you are creating, and it will help by sanitizing values and modifying the gets/sets to 
      match the behavior of the type you declare. I

<pre class="language-javascript"><code>
xtag.create('x-foo', new class extends XTagElement {
  set 'maxVolume::attr' (value){
    // X-Tag automatically maps camel cased getter/setter names to their
    // dashed attribute equivalents. In this example, the `maxVolume` 
    // getter/setter pair maps to the `max-volume` attribute.
  }
});

xtag.create('x-bar', new class extends XTagElement {
  '::template(true)' (){ return '&lt;input /&gt;' }
  set 'disabled::attr(boolean)' (value){
    // The ::attr extended property links node.disabled to gets/sets of 
    // the disabled="" attribute. Because it is declared as a boolean, 
    // all values passed into its getter/setter will be a Boolean.
    this.firstElementChild.disabled = value;
  }
});
</code></pre>

<hr/>

<h3>The DL on Events</h3>
<p>
  X-Tag provides a powerful event system you'll use often in developing your components.
  We'll cover the basics here, and leave the more advanced features for a special tutorial dedicated to the topic.
</p>

<p>
  To add event listeners to your component (either native or custom events), you'll be using the <code>event</code> extension. To do so, add a property to your 
  Custom Element definition that matches the name of the event you want to listen for, plus the <code>::event</code> extension flag. When your class definition 
  is processed by X-Tag's create method, the <code>event</code> extension will remove the property, add a listener using the supplied property name with the 
  function you supplied as the handler.
</p>

<pre class="language-javascript"><code>
xtag.register('x-foo', {
  'click::event': function(){
    // attaches a click listener that calls this function when
    // the user clicks an element inside the custom element
  },
  'focus::event': function(){
    // attaches a focus listener that calls this function when
    // something inside your custom element is focused.
  }
});
</code></pre>

<hr/>

<h3>Gettin' Jedi with Pseudos</h3>

<p>
  One advanced feature of X-Tag you should be aware of right off the bat is the <code>delegate</code> pseudo.
  X-Tag features a function modifier system called <code>pseudos</code> which allows you to seamlessly wrap
  functions anywhere in your custom element defintion object (lifecycle callbacks, methods, accessors, and events)
  to extend their functionality. The <code>delegate</code> pseudo enables you to quickly add event delegation
  (filtering of event targets based on CSS expressions) to any event function you add to your component. Here's an example:</p>

<pre class="language-javascript"><code>
xtag.register('x-foo', {
  content: '&lt;input/&gt;',
  events: {
    'tap:delegate(input)': function(){
      // Perform an action only when the user taps on an
      // &lt;input/&gt; element within your component.
    }
  }
});
</code></pre>

<h4>Create your own Pseudo:</h4>

<p>
  Once you create a pseudo and add it to the main xtag.pseudos object, as show below,
  you can then use it on any key of your custom element definition objects that has a
  function as its value.
</p>

<pre class="language-javascript"><code>
xtag.pseudos.foo = {
  onParse: function(ctor, property, args, fn){
    /*
      Parse is called when the pseudos specified in a declaration are being 
      compiled and wrapped around the function they are being applied to.
    */

    ctor: the Custom Element Class definition
    property: property the pseudo is being applied to (ex: ping:foo, property = ping)
    args: arguments from the pseudo definition (ex: prop:foo(1, 2), args = [1, 2])
    fn: the function the pseudo is wrapping in the pseud chain
  },
  onInvoke: function(node, obj){
    /*
      Invoke is called any time the pseudo-wrapped function is called. This is where 
      you perform whatever action you desire on the node or object the pseudo targets.

      node: the element
      obj: object composed of these properties: { fn: fn, args: args, detail: detail } 
    */
  }
};
</code></pre>

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