WCAG 1.0 1.1 Provide a text equivalent for every non-text element (e.g., via "alt", "longdesc", or in element content). … This includes: images, graphical representations of text (including symbols), image map regions, animations (e.g., animated GIFs), applets and programmatic objects, ascii art, frames, scripts, images used as list bullets, spacers, graphical buttons, sounds (played with or without user interaction), stand-alone audio files, audio tracks of video, and video. (P1)

We will look at WCAG 2.0 - but how do testing tools do