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POAccessibility: How to mark up information conveyed only by colour accessibly?
 

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  1. POAccessibility: How to mark up information conveyed only by colour accessibly?
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    <p>I am working on a web application that offers, essentially, Diff for legal documents. That is, it can show changes to legal documents over time in a similar way to a graphical Diff utility.</p> <p><img src="https://i.stack.imgur.com/8d7vx.gif" alt="Example of colour coding"></p> <p>It uses a wide range of text styles, more than my example - at least 3 colours, and strikethrough - to convey meaning. I'd like advice about how to implement this as accessibly as possible. The markup will probably be fairly unsemantic, something like </p> <pre><code>&lt;span class="col-repealed"&gt;The Commissioners before whom an appeal under this section is brought&lt;/span&gt; &lt;span class="col-inserted"&gt;On an appeal that is notified to the tribunal&lt;/span&gt;, the tribunal must consider whether the registration of the pension scheme ought to have been withdrawn. </code></pre> <p>I will be testing with colour blindness simulators to ensure the colours are all adequately differentiatible. I am also planning to create a black-and-white print stylesheet (where I'd probably change colours to various underline or outline styles, and also print a key to the styles.)</p> <p>I'm wondering about users of screen readers though. I believe this calls for an aural stylesheet, with different voices standing in for different colours. I've never done aural stylesheets before. Are they well enough supported to be worth the effort? Are there other things I could or should do? (E.g. title attributes on the spans)</p>
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    1. COIf you're describing insertions and deletions from a document, use `<ins>` and `<del>`.
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      1. POAccessibility: How to mark up information conveyed only by colour accessibly?
      1. USQuentin
    2. COI would say that methods explained in this article could be useful to you: http://webaim.org/techniques/css/invisiblecontent/ This basically outlines how to hide some content from view on screen whilst still have text which a screen reader can access. If the text you 'hide' is descriptive enough then i would say that you could easily give your users indication of content. Taking this a step further you could use Javascript or JQuery to add your content automatically if certain style elements are found.
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      1. POAccessibility: How to mark up information conveyed only by colour accessibly?
      1. USPhilip Bevan
 

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