If this were a commercial project then I could understand the complaint.. but this is just a small, for-fun project and they have little motivation to put the extra effort into support for all browsers.
https://bellard.org/jslinux/vm.html?url=win2k.cfg&mem=192&gr...
Chrome almost became the new IE and Google, despite it's motto, the new Microsoft. Ok, the desktop? Android rules the smartphone sales in the world, and its online services are used by millions, with far more metadata grabbing than w9x/wxp on its day and with the same propietary OSes.