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Writing inline demos | Infusion
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<a class="logo" href="https://heydon.github.io/infusion/" aria-label="Infusion pattern library home page">
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</a>
<p class="library-desc">Documentation for the <strong>Infusion</strong> pattern library builder. This documentation is constructed using the builder itself.</p>
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<ul id="patterns-list">
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<a href="https://heydon.github.io/infusion/patterns/installation/" >
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<span class="text">Installation</span>
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<a href="https://heydon.github.io/infusion/patterns/library-setup/" >
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<span class="text">Library setup</span>
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<a href="https://heydon.github.io/infusion/patterns/serving/" >
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<span class="text">Serving</span>
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</a>
</li>
<li>
<h3>Writing</h3>
<ul>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/library-structure/" >
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<span class="text">Library structure</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/markdown-and-metadata/" >
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<span class="text">Markdown &amp; metadata</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/expandable-sections/" >
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<span class="text">Expandable sections</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/including-images/" >
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<span class="text">Including images</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/notes-and-warnings/" >
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<span class="text">Notes &amp; warnings</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/writing/references/" >
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<span class="text">References</span>
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</a>
</li>
</ul>
</li>
<li>
<h3>Exhibiting code</h3>
<ul>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/code/code-blocks/" >
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<span class="text">Code blocks</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/code/codepen-embedding/" >
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<svg class="bookmark" aria-hidden="true" height="50" width="40" viewBox="0 0 40 50"><use xlink:href="#bookmark"></use></svg>
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<span class="text">CodePen embedding</span>
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</a>
</li>
<li class="pattern">
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<a href="https://heydon.github.io/infusion/patterns/code/writing-inline-demos/" aria-current="page">
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<span class="text">Writing inline demos</span>
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</a>
</li>
</ul>
</li>
</ul>
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</div>
</header>
<div class="main-and-footer">
<div>
<main id="main">
<h1>Writing inline demos</h1>
<p>There are some issues with
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<a class="pattern-link" href="https://heydon.github.io/infusion/patterns/code/codepen-embedding/">
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<svg class="bookmark" aria-hidden="true" height="50" width="40" viewBox="0 0 40 50"><use xlink:href="#bookmark"></use></svg>CodePen embedding</a>
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, like them not working offline. They also come with CodePen branding, which will clash with the pattern you&rsquo;re trying to illustrate.</p>
<p><strong>Infusion</strong> offers another option: a special <code>demo</code> shortcode that allows you to write HTML, CSS, and JavaScript directly into the markdown file. The outputted demo is encapsulated using Shadow DOM, so you don&rsquo;t have to worry about broken styles and global JS.</p>
<p>Here&rsquo;s the example code for an inline demo of a toggle button:</p>
<pre class="language-html line-numbers"><code class="language-html" data-codeblock-shortcode>
&#x7b;{&lt;demo>}}
&lt;button aria-pressed="false">Toggle Me&lt;/button>
&lt;style>
button {
background: DarkCyan;
color: white;
border: 0;
font-size: 1.5rem;
padding: 0.5em 1em;
border-right: 5px solid #000;
border-bottom: 5px solid #000;
}
[aria-pressed="true"] {
border: 0;
border-top: 5px solid #000;
border-left: 5px solid #000;
}
&lt;/style>
&lt;script>
var toggle = demo.querySelector('[aria-pressed]');
toggle.addEventListener('click', (e) => {
let pressed = e.target.getAttribute('aria-pressed') === 'true';
e.target.setAttribute('aria-pressed', !pressed);
});
&lt;/script>
&#x7b;{&lt;/demo>}}
</code></pre>
<p>Note the <code>demo.querySelector</code> on line <code>21</code>. <strong>Infusion</strong> automatically provides <code>demo</code>, representing the root node of the demo. It&rsquo;s like the <code>document</code> keyword but for a demo&rsquo;s subtree.</p>
<p>Here&rsquo;s a live demo of&hellip; the demo:</p>
<p>
<div class="demo-container">
<div class="demo" id="demo-CiZsdDtidXR0b24"></div>
<template id="template-CiZsdDtidXR0b24">
<button aria-pressed="false">Toggle Me</button>
<style>
button {
background: DarkCyan;
color: white;
border: 0;
font-size: 1.5rem;
padding: 0.5em 1em;
border-right: 5px solid #000;
border-bottom: 5px solid #000;
}
[aria-pressed="true"] {
border: 0;
border-top: 5px solid #000;
border-left: 5px solid #000;
}
</style>
<script>
var toggle = demo.querySelector('[aria-pressed]');
toggle.addEventListener('click', (e) => {
let pressed = e.target.getAttribute('aria-pressed') === 'true';
e.target.setAttribute('aria-pressed', !pressed);
});
</script>
</template>
<script>
(function() {
var root = document.getElementById('demo-CiZsdDtidXR0b24');
if (document.head.attachShadow) {
root.attachShadow({mode: 'open'});
var template = document.getElementById('template-CiZsdDtidXR0b24');
var script = template.content.querySelector('script');
if (script) {
script.textContent = `(function() { var demo = document.getElementById(\'demo-CiZsdDtidXR0b24\').shadowRoot; ${script.textContent} })()`
}
root.shadowRoot.appendChild(document.importNode(template.content, true));
} else {
root.innerHTML = '<p class="site-error"><strong style="font-weight:bold">Site error:</strong> Shadow DOM is needed to display encapsulated demos. The browser does not have an issue with the demo code itself.</p>';
}
})();
</script>
</div>
</p>
<p><aside aria-label="note" class="note">
<div>
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<img src="https://heydon.github.io/infusion/images/icon-info.svg" alt="">
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<p>Firefox does not currently support Shadow DOM and <strong>Infusion</strong> does not include a polyfill. Firefox will output an error message. These demos function correctly in Chrome, Safari, and Opera.</p>
</div>
</aside>
</p>
</main>
<footer role="contentinfo">
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Powered by <strong>Infusion</strong>, a <strong>The Paciello Group</strong> project<br>
For general enquiries, contact us on info@paciellogroup.com
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