This looks fine in the latest stable chromium on bionic (and in the snap too). See attached screenshot. The only place where the rainbow is not rendered correctly is in the tab handle, but that's a different issue than the one originally reported.
** Attachment added: "chromium-rainbow.png" https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1779569/+attachment/5173096/+files/chromium-rainbow.png ** Changed in: chromium-browser (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1779569 Title: 🌈 looks odd in thunderbird, chrome/chromium, okish in firefox To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1779569/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs