Requirements Axe tool Nu HTML validator Test Copy testcheckboxes.php to your Moodle root directory. Open it on your browser (e.g. " [YOUR_MOODLE_URL] /testcheckboxes.php ") View the page source and validate it using the Nu HTML validator Confirm that you don't get any validation errors about related to the checkbox elements and their labels. Open your browser's dev tools. Go to the axe tab. On the test page, tab through all the form elements to show the validation errors until you reach the " Save changes " button. Back on the axe tab, analyse the page. Confirm that you don't get any validation errors related to the checkboxes and aria-described attributes. Right click on the " Sample required text " field and inspect it. You should see it's HTML code highlighted on the dev tools. With the error message still displayed, confirm that its " aria-describedby " attribute is set to " id_error_text_1 " Enter some text it in and press tab. Confirm that its " aria-describedby " attribute has now disappeared along with its error message. Inspect Checkbox 1. You should see it's HTML code highlighted on the dev tools. With the error message still displayed, confirm that its " aria-describedby " attribute is set to " id_error_cbox1 " Tick Checkbox 1. Confirm that its " aria-describedby " attribute has now disappeared along with its error message. Do the same for Checkbox 2 and confirm that the behaviour is the same as Checkbox 1's. Inspect Checkbox 3. You should see it's HTML code highlighted on the dev tools. With the error message still displayed, confirm that its " aria-describedby " attribute is set to " id_cbox3_description id_error_cbox3 " Tick Checkbox 3. Confirm that its " aria-describedby " attribute is now set to " id_cbox3_description " and its error message has now disappeared.