a11y.css
This CSS file intends to warn developers about possible risks
...You should obviously do some manual check by hand to know whether the code should or should not be fixed. You can also use the form on the left sidebar to define the minimum level and language, in order to generate a custom bookmarklet. Then simply drag the green button to your bookmarks, and you're done! You're now able to use a11y.css on every page you visit by simply clicking on this bookmark.