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    <p>You need two additional ways how to convey the meaning:</p> <ul> <li>another visual cue for users that can’t access the color</li> <li>semantic annotations for users that can’t access the visual design at all</li> </ul> <h2>Another visual cue</h2> <p>For repeals, strikethrough would be sufficient, as this is color-independent.</p> <p>For insertions, you should add an additional cue (see WCAG 2.0: <a href="http://www.w3.org/TR/WCAG20/#visual-audio-contrast-without-color" rel="nofollow">1.4.1 Use of Color</a>), for example a border, an underline, etc.</p> <p>See "<a href="http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G182" rel="nofollow">Ensuring that additional visual cues are available when text color differences are used to convey information</a>" for some more examples.</p> <h2>Semantic annotation</h2> <h3>with HTML</h3> <p>HTML(5) defines the elements <a href="http://www.w3.org/TR/2013/CR-html5-20130806/edits.html#edits" rel="nofollow"><code>del</code> and <code>ins</code> for "edits to the document"</a>.</p> <p>So your example markup should become:</p> <pre><code>&lt;del&gt;The Commissioners before whom an appeal under this section is brought&lt;/del&gt; &lt;ins&gt;On an appeal that is notified to the tribunal&lt;/ins&gt;, the tribunal must consider whether the registration of the pension scheme ought to have been withdrawn. </code></pre> <h3>with natural language</h3> <p>If you can’t use it, you would have to provide the start and end of both, repeals and insertions, in the text. Which would get really messy.</p> <pre><code>&lt;span&gt;START REPEAL 1&lt;/span&gt; &lt;span class="col-repealed"&gt;The Commissioners before whom an appeal under this section is brought&lt;/span&gt; &lt;span&gt;END REPEAL 1&lt;/span&gt; &lt;span&gt;START INSERTION 1&lt;/span&gt; &lt;span class="col-inserted"&gt;On an appeal that is notified to the tribunal&lt;/span&gt; &lt;span&gt;END INSERTION 1&lt;/span&gt;, the tribunal must consider whether the registration of the pension scheme ought to have been withdrawn. </code></pre> <p>Ugly, and very hard to grasp.</p> <h3>with characters</h3> <p>Similar would be the use of special characters (for example <a href="http://en.wikipedia.org/wiki/ISO_5776" rel="nofollow">ISO 5776</a>, correction/proofreading marks, …).</p> <p>For insertions, for example, <a href="http://en.wikipedia.org/wiki/Bracket#Quine_corners_.E2.8C.9E.E2.8C.9F.2C_.E2.8C.9C.E2.8C.9D.2C_and_half_brackets_.E2.B8.A4.E2.B8.A5.2C_.E2.B8.A2.E2.B8.A3" rel="nofollow">half brackets</a> for English, i.e., <code>⌊</code> and <code>⌋</code>:</p> <blockquote> <p>Half brackets are used in English to mark added text, such as in translations: </p> <blockquote> <p>"Bill saw ⸤her⸥".</p> </blockquote> </blockquote> <p>And for repeals, for example, the <a href="http://en.wikipedia.org/wiki/Dele" rel="nofollow">deleatur</a>, i.e. <code>₰</code> (has no clear start and end, though):</p> <blockquote> <p>A dele or deleatur […] is a proofreading symbol used to mark something for deletion.</p> </blockquote> <p>But I <em>guess</em> (though I don’t know) that most screen readers wouldn’t read them.</p> <p>(Of course these could be used as visual cues instead, inserted via CSS.)</p> <h3>special markup language</h3> <p><a href="http://criticmarkup.com/" rel="nofollow">http://criticmarkup.com/</a> is a project to provide a simple plain text markup language to "track changes to documents". Depending on your visitors, you could use this (or a similar) markup language to convey the edits.</p>
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    1. POAccessibility: How to mark up information conveyed only by colour accessibly?
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