Providing accessible web products is a challenge. In particular, the implementation of requirements is still a problem for many developers who may not have the necessary skills to perform this task, including difficulty in interpreting reference documents. This paper presents the AccTrace, a CASE tool (Eclipse plugin) that uses an ontology to specify the technical implementation of accessibility and promotes traceability of accessibility requirements from conception to the coding phases. This may give the developer useful information for the construction of accessible product.