After I applied Aramaic web fonts into Template:Syriac at English Wikisource, all the letters failed to present their contextual forms. For example, ܐܣܛܪܢܓܠܐ → ܐܣܛܪܢܓܠܐ
You can see the problem here: https://en.wikisource.org/wiki/Template:Syriac/testcases