Test on Boost theme Download optiontest.php to your moodle root directory. Open it on your web browser. Inspect the option tags of the various select elements and check and confirm the options have the following attributes: value custom-attr data-otherval Confirm that Option 1 is selected for all the select elements (Select Groups and Select Groups Inline will have " Option X - 1 " selected. It doesn't matter, we just want to confirm that the "selected" attribute is being set.) Check that Option 2 is disabled for all of the select elements. For Select Groups and Select Groups-Inline , " Option X - 2 " are disabled. Check that Option 3 has its label shown instead (e.g. " Option 3 label ") Check the values for the " label ", " custom-attr " and " data-otherval " attributes. Confirm that the values are not double quoted.