To provide the user with greater control over the size and colour contrast of text, one option is to provide controls within the webpage that allow the user to adjust the size and colour of the text. Such controls might directly adjust the CSS of specific elements or load in a different style sheet altogether. Another option is to provide a link to an alternative version of the webpage that has sufficient size and contrast.
Provide a control at the top of the webpage that allows the user to increase the size and colour contrast of the text on the webpage. This could be achieved using JavaScript, to adjust the CSS style attributes of the elements on the webpage. A more robust solution would be to use a PHP style sheet switcher to swap the style sheet completely, without relying on the user having JavaScript enabled. Alternatively, simply provide a link to a version of the webpage that has sufficient text size and colour contrast.
No example is available.