Large scale automatic web accessibility validation

Digital accessibility is considered an important aspect to allow all people, including those with permanent or temporary disabilities, to access the continuously increasing number of digital services. This raises the need for tools able to provide support for monitoring the level of accessibility of a large number of websites in order to understand their actual level of accessibility, and identify the areas that need more interventions for their improvement. We present how we have extended a tool for accessibility validation for this purpose, and the results that we obtained in the validation of about 2.7 million Web pages of Italian public administration Web sites.