Test for bug 39799. The following sequences made of two or three IPA tone letters (˥ ˦ ˧ ˨ ˩) should be ligated as if they're complex scripts.

This page uses web fonts for Arimo, Tinos and Cousine. Other fonts in the menu are not served as web fonts and you need to have them installed on your local machine. In addition, you need to use Firefox to test this page with web fonts because 1) Chrome does not yet pass GSUB/GPOS tables for web fonts 2) it does not yet have a patch for webkit bug 39799 applied.