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Code blocks | Infusion
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Documentation for the <strong>Infusion</strong> documentation builder, built with <strong>Infusion</strong> itself.
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<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/project-structure/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Project structure</span>
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</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/markdown-and-metadata/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Markdown &amp; metadata</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/expandable-sections/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Expandable sections</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/notes-and-warnings/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Notes &amp; warnings</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/references/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">References</span>
</a>
</li>
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<li class="pattern">
<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/snippets/" >
<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
<span class="text">Snippets</span>
</a>
</li>
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<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/writing/tables-of-contents/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Tables of contents</span>
</a>
</li>
</ul>
</li>
<li>
<h3>Media</h3>
<ul>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/media/including-images/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Including images</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/media/including-videos/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Including videos</span>
</a>
</li>
</ul>
</li>
<li>
<h3>Coding</h3>
<ul>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/code-blocks/" aria-current="page">
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Code blocks</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/demo-embedding/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Demo embedding</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/writing-inline-demos/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Writing inline demos</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/color-palettes/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Color palettes</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/command-line/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Command line</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/file-trees/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">File trees</span>
</a>
</li>
<li class="pattern">
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<a href="https://thepaciellogroup.github.io/infusion/patterns/coding/tested/" >
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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<span class="text">Tested using...</span>
</a>
</li>
</ul>
</li>
</ul>
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</nav>
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</div>
</header>
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<div class="main-and-footer">
<div>
<main id="main">
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<h1>
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<svg class="bookmark-icon" aria-hidden="true" viewBox="0 0 40 50" focusable="false">
<use xlink:href="#bookmark"></use>
</svg>
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Code blocks
</h1>
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<p>Markdown already supports code samples both inline (using single backticks like `some code here`) and in blocks. <strong>Infusion</strong> will syntax highlight HTML, CSS, and JavaScript if you provide the correct language in the formulation of the block.</p>
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<p>So, this&hellip;</p>
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<pre class=""><code data-codeblock-shortcode>
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```html
&lt;button aria-pressed="false">toggle me&lt;/button>
```
</code></pre>
<p>&hellip; will result in this:</p>
<pre><code class="language-html">&lt;button aria-pressed=&quot;false&quot;&gt;toggle me&lt;/button&gt;
</code></pre>
<p>Note that the syntax highlighting uses a greyscale theme. <strong>Infusion</strong> is careful not to use color as part of its own design, because these colors may clash with those of the design being illustrated and discussed.</p>
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<aside aria-label="note" class="note">
<div>
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<svg class="sign" aria-hidden="true" viewBox="0 0 41.667306 41.66729" focusable="false">
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<use xlink:href="#info"></use>
</svg>
<p>To preserve the wrapping inside code blocks, horizontal scrolling is implemented. To make sure scrolling is keyboard accessible, code blocks are focusable. An <code>aria-label</code> is provided to identify the code block to screen reader users.</p>
</div>
</aside>
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<h2 id="annotated-code">Annotated code</h2>
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<p><strong>Infusion</strong> offers the ability to highlight and annotate specific parts of your code examples using the <code>code</code> shortcode. Take an accessible dialog. You may wish to point out key attributes that make that dialog support assistive technologies:</p>
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<div class="code-annotated "><code>
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&lt;div <span class='highlight'>role=&#34;dialog&#34;</span> <span class='highlight'>aria-labelledby=&#34;dialog-heading&#34;</span>&gt;
&lt;button <span class='highlight'>aria-label=&#34;close&#34;</span>&gt;x&lt;/button&gt;
&lt;h2 <span class='highlight'>id=&#34;dialog-heading&#34;</span>&gt;Confirmation&lt;/h2&gt;
&lt;p&gt;Press &lt;strong&gt;Okay&lt;/strong&gt; to confirm or &lt;strong&gt;Cancel&lt;/strong&gt;&lt;/p&gt;
&lt;button&gt;Okay&lt;/button&gt;
&lt;button&gt;Cancel&lt;/button&gt;
&lt;/div&gt;
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</code></div>
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<p>You mark out the highlighted areas using triple square brackets like so:</p>
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<pre class=""><code data-codeblock-shortcode>
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&#x7b;{&lt;code>}}
&lt;div [[[role="dialog"]]] [[[aria-labelledby="dialog-heading"]]]>
&lt;button [[[aria-label="close"]]]>x&lt;/button>
&lt;h2 [[[id="dialog-heading"]]]>Confirmation&lt;/h2>
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&lt;p>Press <strong>Okay</strong> to confirm or <strong>Cancel</strong>&lt;/p>
&lt;button>Okay&lt;/button>
&lt;button>Cancel&lt;/button>
&lt;/div>
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&#x7b;{&lt;/code>}}
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</code></pre>
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<p>Better still, if you include <code>numbered=&quot;true&quot;</code>, each highlight is enumerated so you can reference it directly in the ensuing text. If you follow the shortcode directly with an ordered list, the styles match:</p>
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<div class="code-annotated numbered"><code>
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&lt;div <span class='highlight'>role=&#34;dialog&#34;</span> <span class='highlight'>aria-labelledby=&#34;dialog-heading&#34;</span>&gt;
&lt;button <span class='highlight'>aria-label=&#34;close&#34;</span>&gt;x&lt;/button&gt;
&lt;h2 <span class='highlight'>id=&#34;dialog-heading&#34;</span>&gt;Confirmation&lt;/h2&gt;
&lt;p&gt;Press &lt;strong&gt;Okay&lt;/strong&gt; to confirm or &lt;strong&gt;Cancel&lt;/strong&gt;&lt;/p&gt;
&lt;button&gt;Okay&lt;/button&gt;
&lt;button&gt;Cancel&lt;/button&gt;
&lt;/div&gt;
</code></div>
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<ol>
<li>The dialog is only announced as a dialog if it takes the <code>dialog</code> ARIA role</li>
<li>The <code>aria-labelledby</code> relationship attribute makes the element carrying the <code>id</code> it points to its label</li>
<li>The close button uses <code>aria-label</code> to provide the text label &ldquo;close&rdquo;, overriding the text content</li>
<li>The heading is used as the dialog&rsquo;s label. The <code>aria-labelledby</code> attribute points to its <code>id</code></li>
</ol>
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<p>You just include <code>numbered=&quot;true&quot;</code> on the opening shortcode tag:</p>
<pre class=""><code data-codeblock-shortcode>
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&#x7b;{&lt;code numbered="true">}}
&lt;div [[[role="dialog"]]] [[[aria-labelledby="dialog-heading"]]]>
&lt;button [[[aria-label="close"]]]>x&lt;/button>
&lt;h2 [[[id="dialog-heading"]]]>Confirmation&lt;/h2>
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&lt;p>Press <strong>Okay</strong> to confirm or <strong>Cancel</strong>&lt;/p>
&lt;button>Okay&lt;/button>
&lt;button>Cancel&lt;/button>
&lt;/div>
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&#x7b;{&lt;/code>}}
1. The dialog is only announced as a dialog if it takes the `dialog` ARIA role
2. The `aria-labelledby` relationship attribute makes the element carrying the `id` it points to its label
3. The close button uses `aria-label` to provide the text label "close", overriding the text content
4. The heading is used as the dialog's label. The `aria-labelledby` attribute points to its `id`
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</code></pre>
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<h3 id="javascript-example">JavaScript example</h3>
<div class="code-annotated numbered"><code>
/* Enable scrolling by keyboard of code samples */
(function () {
var codeBlocks = document.querySelectorAll(&#39;pre, .code-annotated&#39;);
Array.prototype.forEach.call(codeBlocks, function (block) {
if (block.querySelector(&#39;code&#39;)) {
block.setAttribute(<span class='highlight'>&#39;role&#39;, &#39;region&#39;</span>);
block.setAttribute(<span class='highlight'>&#39;aria-label&#39;, &#39;code sample&#39;</span>);
if (block.scrollWidth &gt; block.clientWidth) {
block.setAttribute(&#39;tabindex&#39;, &#39;0&#39;);
}
}
});
}());
</code></div>
<ol>
<li>The <code>region</code> role announces the block as a region</li>
<li>The <code>aria-label</code> describes the kind of content to be expected in the region</li>
</ol>
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<aside aria-label="note" class="note">
<div>
<svg class="sign" aria-hidden="true" viewBox="0 0 41.667306 41.66729" focusable="false">
<use xlink:href="#info"></use>
</svg>
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<p>As you may have noticed, using specified highlights with the <code>code</code> shortcode sacrifices syntax highlighting. If you want syntax highlighting you must use the markdown triple back-tick syntax and annotation is not available.</p>
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