Tool endpoints should use a button instead of an <a> tag for the trigger element

Behat already covers copying these URLs to clipboard but we can test space activation of the now-button element. 1. Log in to the site 2. Enable "Publish as LTI tool" enrolment plugin via Site admin > Plugins > Enrolments > Manage enrolments 3. Go to Site admin > Plugins > Enrolments > Publish as LTI tool > Tool registration 4. Create a new registration, just using a dummy name (anything is fine) 5. After clicking continue, when you see the "Tool details" screen, confirm the following: You can copy each URL to clipboard by clicking the button next to the field You can tab to the button After tabbing to the button, you can activate it by pressing space After tabbing to the button, you can activate it by pressing enter