Notes To test this, the site needs to be registered with Brickfield. If you don't have a Brickfield account, you can register here . For free accounts, you may need to delete the site registration for the first site you registered and then create a new registration for the next test site. Setup: Activate your site with Brickfield in "Site administration / Plugins / Admin tools / Accessibility / Brickfield registration" by entering the API and Secret keys. Enable analysis requests in "Site administration / Plugins / Admin tools / Accessibility / Accessibility toolkit settings" Test: Create a new course Add a " Text and media area " Use the editor's source code view and paste the following HTML. < p style = "color:rgb(255, 255, 255); background:fixed rgb(204, 204, 204) center;" >1 This is not contrasty enough.</ p > < p style = "color:rgb(255, 255, 255); background:fixed rgb(0, 0, 0) center;" >2 This is contrasty enough.</ p > < p style = "color:rgb(255, 255, 255); background-color:rgb(204, 204, 204);" >3 This is not contrasty enough.</ p > < p style = "color:rgb(255, 255, 255); background:fixed rgb(204, 204, 204) center;" >4 This is not contrasty enough...</ p > Save and go back to the course. Add the "Accessibility review" block to the course. Click on the "Submit to Analysis" button to request that the course be analyzed using the accessibility toolkit. Run the below commands on your favourite terminal: php admin /cli/scheduled_task .php --execute= '\tool_brickfield\task\update_summarydata'   php admin /cli/cron .php The accessibility toolkit should now correctly find the three contrast errors for paragraphs 1, 3, and 4. (You can also confirm by clicking on the " View accessibility toolkit " button on the Accessibility toolkit block.