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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 2 ~ Web Accessibility ~ Girl Develop It</title>
<meta name="description" content="This is the Girl Develop It Web Accessibility curriculum. It was originally developed by Sylvia Pellicore and modified by Marcy Sutton.
This course is meant to be taught as a two-week class. The primary slides are designed for maximum presentability--one picture, one sentence. The vertical slides contain speaker notes, to make the slides more useful as a shared resource.
Each of the slides is customizable according to the needs of a given class or audience. The GitHub repository contains an Instructor Guide, with further information about the course.">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/simple.css" id="theme">
<link rel="stylesheet" href="css/accesscustom.css">
<!-- For syntax highlighting -->
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<!-- dark editor<link rel="stylesheet" href="lib/css/dark.css">-->
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<link rel="stylesheet" href="plugin/accessibility-helper/css/accessibility-helper.css">
<!-- If the query includes 'print-pdf', include the PDF print sheet -->
<script>
if( window.location.search.match( /print-pdf/gi ) ) {
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link.rel = 'stylesheet';
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link.href = 'css/print/pdf.css';
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}
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<link rel="stylesheet" href="css/print/pdf.css" type="text/css" media="print">
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<!-- Opening slides -->
<section>
<img src="img/circle-gdi-logo.png" alt="Girl Develop It" style="max-height: 400px;" class="nonbordered">
<h1>Intro to Web Accessibility</h1>
<h2>Class 2</h2>
</section>
<!-- Welcome-->
<section>
<h2>Welcome!</h2>
<p>Girl Develop It is here to provide affordable and accessible programs to learn software through mentorship and hands-on instruction.</p>
<p class ="green">Some "rules"</p>
<ul>
<li>We are here for you!</li>
<li>Every question is important</li>
<li>Help each other</li>
<li>Have fun</li>
</ul>
</section>
<!-- Intro: What is Accessibility?-->
<section>
<h2>What is accessibility?</h2>
<ul>
<li>Accessibility is about making your sites useful to as many people as possible.</li>
<li>Accessibility is about overcoming barriers.</li>
<li>Accessibility is about helping your users.</li>
</ul>
<aside class="notes">Just a quick review</aside>
</section>
<section>
<h2>What are the common problems?</h2>
<div id="webaim-survey-problematic-items" style="background: url(img/webaim-survey-problematic-items.png) no-repeat center top; background-size: 75% auto; padding-top: 50%; width: 100%;">
<ul class="visuallyhidden">
<li>The presence of inaccessible Flash content</li>
<li>CAPTCHA - images presenting text used to verify that you are a human user</li>
<li>Links or buttons that do not make sense</li>
<li>Images with missing or improper descriptions (alt text)</li>
<li>Screens or parts of screens that change unexpectedly</li>
<li>Complex or difficult forms</li>
<li>Lack of keyboard accessibility</li>
<li>Missing or improper headings</li>
<li>Too many links or navigation items</li>
<li>Complex data tables</li>
<li>Inaccessible or missing search functionality</li>
<li>Lack of "skip to main content" or "skip navigation" links</li>
</ul>
</div>
<p>Source: <a href="http://webaim.org/projects/screenreadersurvey5/" target="_blank" title="Link opens in a new window">WebAIM Screen Reader Survey, February 2014<span class="visuallyhidden"> opens in a new window</span></a></p>
<aside class="notes">Introduce the WebAIM Screen Reader survey and show the common problems. Marcy's version of the <a href="http://marcysutton.com/stuff/GDI-Accessibility/img/webaim-survey-problematic-items.png">infographic</a> highlights topics covered in the two classes. This can be helpful to keep open in a second browser tab so it can be referenced more than once.</aside>
</section>
<section>
<h2>How do I code for accessibility?</h2>
<h3>HTML</h3>
<img src="img/wallace-gromit.jpg" alt="Wallace & Gromit" style="position: absolute; right: 0;" />
<ul style="padding-right: 30%;">
<li>Headings & Semantic Structure</li>
<li>Form Labels & Text Alternatives</li>
<li>Tab Index</li>
<li>External link indicators</li>
</ul>
</section>
<section>
<h2>HTML Headings</h2>
<p>Semantic structure is one of the most important usability features for screen reader users, as it helps them more easily understand and navigate the page structure. Headings also help <em>all</em> your users can and understand content. <a href="http://accessiblehtmlheadings.com/" target="_blank" title="Link opens in a new window">Read more about headings<span class="visuallyhidden"> opens in a new window</span></a>.</p>
<pre><code class="html">// Headings should not skip levels until h1-h4 have been established
<h1>Most important</h1>
<h2>Next most important</h2>
<h3>Third most important</h3>
<h4>Other heading</h4>
</code></pre>
<p>Tip: use the Firefox Web Developer Toolbar to inspect headings. Look under Information > View Document Outline.</p>
<aside class="notes">The metaphor of an outline for a paper or article is helpful here.</aside>
</section>
<section>
<h2>HTML5 Headings</h2>
<h3>Use with caution</h3>
<img src="img/html5-girl.png" alt="HTML5 Girl" />
<p><a href="http://www.paciellogroup.com/blog/2013/10/html5-document-outline/" target="_blank" title="Link opens in a new window">The HTML5 Document Outline
<span class="visuallyhidden"> opens in a new window</span></a><br> by the Paciello Group</p>
<aside class="notes">Talk about <a href="http://tink.co.uk/2013/02/screen-reader-support-for-html5-sections/">screen reader testing</a> of HTML 5 tags & headings and the current state of the HTML5 heading algorithm (h1's that start over with new landmarks). Mention <a href="http://accessibleculture.org/articles/2011/10/jaws-ie-and-headings-in-html5/">bugs with JAWS and IE8.</a></aside>
</section>
<section>
<h2>Form Labels</h2>
<h3>How do they work?</h3>
<!-- explanation here -->
<div class="code-example">
<label for="name-field">Name</label>
<input type="text" id="name-field" name="name-field" placeholder="Type your furry friend's name" />
<div class="float">
<label for="species-dog">Dog</label>
<input type="radio" id="species-dog" name="species" />
</div>
<div class="float">
<label for="species-cat">Cat</label>
<input type="radio" id="species-cat" name="species" />
</div>
<div class="clear"></div>
</div>
<pre><code class="html" data-trim><label for="name-field">Label</label>
<input type="text" id="name-field" name="name-field">
</code></pre>
</section>
<section>
<h2>Let's develop it</h2>
<h3>Add labels to an HTML form</h3>
<pre><code class="html" data-trim><label for="name-field">Label</label>
<input type="text" id="name-field"
name="name-field" placeholder="Type your name" />
</code></pre>
</section>
<section>
<h2>External Links</h2>
<h3>Provide affordances to warn users.</h3>
<img src="img/dont-make-me-think.jpg" alt="Don't Make Me Think by Steve Krug" style="float: right;max-width:25%;" class="nonbordered" />
<img src="img/links-WCAG.png" alt="WCAG 2.0 Link requirements" class="nonbordered" />
<img src="img/how-i-audit-a-website-external-link.png" alt="How I Audit a Website for Accessibility external link indicator" class="nonbordered" />
</section>
<section>
<h2>External Links</h2>
<h3>Let's Look at Some Code</h3>
<pre><code class="html" data-trim>
<a href="goofy.html">Goofy page<a>
<a href="http://disney.com" target="_blank"
title="Link opens in a new window"
class="external-link">
Disney.com
<span class="offscreen">
opens in a new window
<span>
</a>
</code></pre>
<p>For links that open in new windows, an offscreen <code>span</code> inside the link is most reliable for screen readers, but <code>title=""</code> can also be used.</p>
<aside class="notes">A common problem cited in the WebAIM survey is “unexpected screen changes”. Discuss how to warn users of links that open in new windows with offscreen text and title attributes. Include a discussion about how it's really about usability in general. Recommended reading: “Don't Make Me Think” by Steve Krug</aside>
</section>
<section>
<h2>Tab Index</h2>
<h3>What is it?</h3>
<p>The tabindex attribute explicitly defines the tab order for focusable elements (typically links and form controls) within a page. It can be used to define whether elements should be focusable. (<a href="http://webaim.org/techniques/keyboard/tabindex" target="_blank" title="Link opens in a new window">WebAIM<span class="visuallyhidden"> opens in a new window</span></a>)</p>
<div style="padding-top:20px;">
<h3 tabindex="0">Focusable Heading</h3>
<a href="#" tabindex="-1">Link focusable only by script</a>
<div tabindex="0">Focusble div</div>
</div>
<aside class="notes">
<p>Source: http://reference.sitepoint.com/html/a/tabindex</p>
<p>Explain tab order. Show a demo of tabIndex=”” attributes on native and non-native elements to show how it affects the flow of a document (anchor, input, div, heading, etc.). Explain tab index values of -1, 0 and 1+ their specific purposes</p>
</aside>
</section>
<section>
<h2>Let's Develop It</h2>
<h3>Explore tab-index on native and non-native elements</h3>
<pre><code class="html" data-trim><h1 tabindex="0">Focusable Heading<h1>
<a href="#" tabindex="-1">Link focusable only by script</a>
<div tabindex="1">Div tabbable in new order<div>
</code></pre>
<p>Note: <code>tabindex</code> values higher than 0 require managing the entire page's tab order. Use with caution!</p>
<aside class="notes">Explicitly mention the pitfalls of positive tabindex values, including the extra maintance and testing. Tabindex is like z-index; any positive value will supercede everything else on the page.</aside>
</section>
<section>
<h2>How do I code for accessibility?</h2>
<h3>CSS</h3>
<ul>
<li>Visually Hidden Content</li>
<li>Really Hidden</li>
</ul>
</section>
<section>
<h2>Visually Hidden Content</h2>
<h3>How does it work?</h3>
<pre><code class="css" data-trim>/* Hide only visually, but have it available for screenreaders.
Copied from HTML5 Boilerplate*/
.visuallyhidden {
border: 0;
clip: rect(0 0 0 0);
height: 1px;
margin: -1px;
overflow: hidden;
padding: 0;
position: absolute;
width: 1px;
}
</code></pre>
<p><a href="http://snook.ca/archives/html_and_css/hiding-content-for-accessibility">Hiding Content for Accessibility</a></p>
</section>
<section>
<h2>Really Hidden</h2>
<h3>How to show and hide content from all users</h3>
<pre><code class="css" data-trim>.reallyHidden {
display: none;
visibility: hidden;
}
.notHidden {
display: block;
visibility: visible;
}
</code></pre>
</section>
<section>
<h2>Let's Develop It</h2>
<p>Explore keyboard navigation with content that is hidden and offscreen</p>
</section>
<section>
<h2>How do I code for accessibility?</h2>
<h3>Accessible Rich <br>Internet Applications</h3>
<ul>
<li>Expands HTML's native vocabulary.</li>
<li>Communicates state and purpose to assistive technologies.</li>
<li>Used mainly for custom widgets and web applications.</li>
</ul>
<p style="margin-top:1em;"><a href="https://www.marcozehe.de/2014/03/27/what-is-wai-aria-what-does-it-do-for-me-and-what-not/" target="_blank">What is WAI-ARIA, what does it do for me, and what not?<span class="visuallyhidden"> opens in a new window</span></a></p>
</section>
<section>
<h2>ARIA Core Components</h2>
<div class="inset-width">
<div class="definition">
<h4 style="margin-top: 0.75em">Roles</h4>
<p>What does this thing do?</p>
<pre><code class="html xml"><form role="search"></code></pre>
</div>
<div class="definition">
<h4 style="margin-top: 0.75em">States</h4>
<p>The current condition of this particular thing</p>
<pre><code class="html xml"><input aria-disabled="true"></code></pre>
</div>
<div class="definition">
<h4 style="margin-top: 0.75em">Properties</h4>
<p>The nature of the thing</p>
<pre><code class="html xml"><input aria-required="true"></code></pre>
</div>
</div>
</section>
<section>
<h2>General Resources</h2>
<ul>
<li><a href="http://webaim.org/projects/screenreadersurvey4/" target="_blank" title="Link opens in a new window">WebAIM Screen Reader Survey<span class="visuallyhidden"> opens in a new window</span></a></li>
<li><a href="https://chrome.google.com/webstore/detail/accessibility-developer-t/fpkknkljclfencbdbgkenhalefipecmb?hl=en" target="_blank" title="Link opens in a new window">Chrome Accessibility Developer Tools<span class="visuallyhidden"> opens in a new window</span></a>, a Chrome extension that does in-browser audits and highlights ARIA properties.</li>
<li><a href="https://addons.mozilla.org/en-US/firefox/addon/web-developer/" target="_blank" title="Link opens in a new window">Web Developer toolbar<span class="visuallyhidden"> opens in a new window</span></a>, a Firefox extension with helpful tools</li>
<li><a href="http://a11yproject.com/" target="_blank">The Accessibility Project<span class="visuallyhidden"> opens in a new window</span></a></li>
<li><a href="http://www.w3.org/TR/aria-in-html/" target="_blank" title="Link opens in a new window">Using ARIA in HTML<span class="visuallyhidden"> opens in a new window</span></a>
</ul>
</section>
</div>
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Introduction to Web Accessibility -- Girl Develop It --
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