Archived posts, February 2009
There is a simple rule that defines which characters you may use with the id attribute: begin with a letter, then add any number of digits, hyphens, underscores, colons, and periods.
Validating WAI-ARIA in HTML or XHTML is currently more difficult than it could be, but it is possible and there is hope that it will be easier in the near future.
Combining the concept of diagnostic CSS with the Stylish Firefox extension makes it easy to apply CSS that reveals invalid or deprecated HTML to any site you want.
WebAIM’s screen reader survey provides some interesting results. Most are expected, but there are some surprises.
It is time to worry less about non-critical bugs in Internet Explorer 6, and eventually we will be able to treat it like we treat Netscape 4.
There is nothing called a “CSS class” in HTML or CSS, so please refer to values of the HTML class attribute as classes or class names instead.
The alt attribute is valid only for images and provides alternative text used when the image cannot be rendered. Do not use it with links and other non-image HTML elements.
With WCAG 2.0 now being a W3C recommendation it is time to check that the tool you use to check colour contrast supports the luminosity contrast ratio algorithm recommended by WCAG 2.0.
Internet Explorer’s text resizing behaviour is different from that of other browsers since IE does not allow the end user to (easily) resize text whose size has been specified in pixels.
The Accessible Rich Internet Applications (WAI-ARIA) specification has reached Last Call Working Draft status, and the W3C wants your feedback.