Yes both Unity and Unreal started their WebGL engine output with asm.js&#x2F;emscripten and Mozilla, they both announced it at GDC with Mozilla that year (2014)[1].<p>[1] <a href="https:&#x2F;&#x2F;blog.mozilla.org&#x2F;blog&#x2F;2014&#x2F;03&#x2F;18&#x2F;gdc-2014-mozilla-and-partners-prove-the-web-is-the-platform-for-gaming&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.mozilla.org&#x2F;blog&#x2F;2014&#x2F;03&#x2F;18&#x2F;gdc-2014-mozilla-an...</a>