  Canvas is a pixel-based inherently inaccessible element in HTML5.Therefore
web users with vision disabilities cannot benefit from Canvas and its desired
semantics and functionality. Regarding to the Canvas application in designing
interactive graphical user interface, vision-impaired users may miss important
information on web sites. This paper utilizes the content-based image retrieval
(CBIR) technique as well as code mapping embedded in a Firefox extension to
present a novel approach in order to make Canvas interactive user interface
accessible. This extension replaces Canvas with an accessible equivalent HTML
environment. Unlike previously done works on Canvas accessibility, the proposed
approach does not impose any rules on developers and designers during Canvas
design.
