Developer credits
Git commits in Moodle 3.8.1 by Kiet.Chan
commit bec0808b18e2563cb710aa292db84747bba31be3 Author: Kiet.Chan <kietlyc2@gmail.com> Date: Wed, 11 Dec 2019 14:56:13 +0800 Tag: v3.8.1 MDL-67417 theme_boost: Tooltip icon stop working after closing using ESC