The simple example of the recurring number illustrates the difficulty of describing both the content and presentation in mathematical expressions succinctly and clearly. It is important to evaluate MathML support before deciding which techniques to use.įind more information about the state of MathML in Webkit-based and in Mozilla-based browsers. Some libraries that polyfill MathML for web browsers, like MathJax, provide support for accessibility features.Īccessibility support for MathML varies, but continues to improve as web browsers and assistive technology evolve.
To see the MathML example below, this Firefox plugin may be needed.
Most web browsers need plugins to render MathML correctly – especially for the new MathML 3.0 features used in this example. As with other images, the author is in the best position to determine what information is intended to be conveyed by the image and construct the text alternative accordingly. In this particular example, the way that the recurrence is shown is important, so it is also described in the text alternative. (In the image, the recurrence is indicated by a line over the ‘3’ in the fourth decimal place.)” The alt text for this recurring number is “0.3333 recurring. The image below displays a recurring decimal number (decimal numbers that never end). However, MathML is emerging as the preferred presentation of accessible math on the Web. Historically, math expressions have often been presented as images because of the difficulty of presenting equations and special math symbols with HTML. See Functional Images: Image used alone as a linked logo. If this logo were linked then it would become a functional image.
For example, there are no minimum color contrast and text size requirements. Images used as logos are exempt from some of the accessibility requirements that apply to other images of text.
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