Understanding Accessibility
by Vivienne Trulock
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Guideline 3. Use markup and style sheets and do so properly.
Checkpoint 3.1 - When an appropriate markup language exists, use markup rather than images to convey information
How do I do it?
Simply use style sheets where ever possible in favour of images. For example, buttons can be made using CSS which look identical to standard images buttons but are accessible, because they use a background image and text, rather than just one image.
Use a markup language like MathML to markup formula, rather than creating images.
Make properly coded HTML tables rather than images with a visual table.
How do I check that it meets the WCAG criteria?
Pages can be checked by opening the associated image file and viewing the images as thumbnails. Pages with images which contain elements which could be marked up with style sheets (such as those which simply contain text and a background colour) should be marked as failing the check as this is simple to achieve with style sheets.
Pages with images which contain formula will also fail the check as this should be marked up using the MathML markup language.
