Test all the buttons in Atto in several browsers (make sure to include ie).
Check for unusual warnings in the javascript console (or weird behaviour).
Run atto behat tests.
There is a newer version - we should upgrade.
MDL-50897 Update Rangy to latest release
MDL-76918 Upgrade Rangy to 1.3.1
MDL-51661 Remove use of deprecated Rangy method createCssClassApplier
Error rendering 'clockify-timesheets-time-tracking-reports:timer-sidebar'. Please contact your Jira administrators.