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accessibility.html
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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Accessibility | Chart.js</title>
<meta name="generator" content="VuePress 1.8.2">
<link rel="icon" href="/docs/3.2.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.2.0/assets/css/0.styles.954f0f15.css" as="style"><link rel="preload" href="/docs/3.2.0/assets/js/app.eecca120.js" as="script"><link rel="preload" href="/docs/3.2.0/assets/js/2.497f764b.js" as="script"><link rel="preload" href="/docs/3.2.0/assets/js/163.6585b948.js" as="script"><link rel="prefetch" href="/docs/3.2.0/assets/js/10.07263a2b.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/100.e51f500f.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/101.4d5d2fc1.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/102.738de75e.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/103.ac1044cf.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/104.b24063c3.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/105.a50b27b7.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/106.15182f3d.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/107.d035245b.js"><link rel="prefetch" href="/docs/3.2.0/assets/js/108.9bb75417.js"><link rel="prefetch" 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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><a href="/docs/3.2.0/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Getting Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>General</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.2.0/general/data-structures.html" class="sidebar-link">Data structures</a></li><li><a href="/docs/3.2.0/general/accessibility.html" aria-current="page" class="active sidebar-link">Accessibility</a></li><li><a href="/docs/3.2.0/general/options.html" class="sidebar-link">Options</a></li><li><a href="/docs/3.2.0/general/colors.html" class="sidebar-link">Colors</a></li><li><a href="/docs/3.2.0/general/fonts.html" class="sidebar-link">Fonts</a></li><li><a href="/docs/3.2.0/general/padding.html" class="sidebar-link">Padding</a></li><li><a href="/docs/3.2.0/general/performance.html" class="sidebar-link">Performance</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Configuration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Chart Types</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Axes</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Developers</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="accessibility"><a href="#accessibility" class="header-anchor">#</a> Accessibility</h1> <p>Chart.js charts are rendered on user provided <code>canvas</code> elements. Thus, it is up to the user to create the <code>canvas</code> element in a way that is accessible. The <code>canvas</code> element has support in all browsers and will render on screen but the <code>canvas</code> content will not be accessible to screen readers.</p> <p>With <code>canvas</code>, the accessibility has to be added with ARIA attributes on the <code>canvas</code> element or added using internal fallback content placed within the opening and closing canvas tags.</p> <p>This <a href="http://pauljadam.com/demos/canvas.html" target="_blank" rel="noopener noreferrer">website<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> has a more detailed explanation of <code>canvas</code> accessibility as well as in depth examples.</p> <h2 id="examples"><a href="#examples" class="header-anchor">#</a> Examples</h2> <p>These are some examples of <strong>accessible</strong> <code>canvas</code> elements.</p> <p>By setting the <code>role</code> and <code>aria-label</code>, this <code>canvas</code> now has an accessible name.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>goodCanvas1<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span> <span class="token attr-name">aria-label</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Hello ARIA World<span class="token punctuation">"</span></span> <span class="token attr-name">role</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>img<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
</code></pre></div><p>This <code>canvas</code> element has a text alternative via fallback content.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>okCanvas2<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>Hello Fallback World<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
</code></pre></div><p>These are some bad examples of <strong>inaccessible</strong> <code>canvas</code> elements.</p> <p>This <code>canvas</code> element does not have an accessible name or role.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>badCanvas1<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
</code></pre></div><p>This <code>canvas</code> element has inaccessible fallback content.</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>canvas</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>badCanvas2<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>400<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Your browser does not support the canvas element.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>canvas</span><span class="token punctuation">></span></span>
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