Setup We need to start this test with the following enabled: Boost theme, TinyMCE text editor, theme designer mode on (theme cache disabled). This is done as follows: Log into your test Moodle site as admin. Navigate to Site administration > Plugins, under the Text editors section, click 'Manage editors'. If the 'TinyMCE HTML editor' is disabled, click the crossed out eye symbol to enable it. If 'TinyMCE HTML editor' is not at the top of the list of editors, click the up arrow in its row until it is at the top of the list. Navigate to Site administration > Appearance > Theme settings. Turn on 'Theme designer mode' by checking the relevant checkbox, and clicking save changes. Navigate to Site administration > Appearance > Theme selector. Click 'Clear theme caches'. When the page reloads, check the current theme is set to Boost. If it is not, click 'Change theme' and change it to Boost. Testing Boost is now fixed Log into your test Moodle site as admin. Navigate to the user's profile (user dropdown at top right of the window > Profile). Click 'Edit profile'. Scroll down to the Description and CONFIRM you see the TinyMCE text editor: Type some text into the text area of Description and CONFIRM the text is a reasonable size (not smaller than the text that says 'Description' to the left of the editor), eg: Click the 'Insert/edit image' button on the top row of the TinyMCE editor: Click the 'Appearance' tab. CONFIRM there is a dropdown menu available for 'Class', and CONFIRM when you click the dropdown, there is a long list of classes, eg:   Navigate to Site administration > Appearance > Theme settings (you may want to do this in a new tab, so it is easier to return to the 'Edit profile' screen shortly). Disable 'Theme designer mode' by unchecking the relevant checkbox, and clicking Save changes. Navigate back to your user's 'Edit profile' screen and click 'Purge all caches' at the very bottom of the page. If you don't see that (debug mode is not enabled in your Moodle site), do a hard browser refresh (eg ctrl+F5 or command+shift+r depending on your operating system). Repeat steps 5-8 above and CONFIRM the relevant steps are still working. Testing Clean is still working as expected Switch your site to 'Clean' theme, clear all caches, then repeat steps 5-8 above again on the 'Edit profile' page. (This will mean you are testing on Clean with designer mode disabled). CONFIRM all relevant steps as before. Turn 'Theme designer mode' back on as you did in the setup steps above, then repeat steps 5-8 above again on the 'Edit profile' page (this will mean you are testing on Clean with designer mode enabled). CONFIRM all relevant steps as before.