Device dependent event handler
Using a device dependent event handler may limit content accessiblity (JavaScript events should be accessible to mouse users and keyboard users).
" An event handler is present that may not be accessible. The JavaScript events in use do not appear to be accessible to both mouse and keyboard users. To be fully accessible, critical JavaScript interaction should be device independent. Ensure that critical functionality and content is accessible by using a device independent event handler (which responds to both keyboard and mouse) or by using both a mouse dependent and a keyboard dependent event handler. " (from WAVE tool)
Related to #273 (closed).