http://webassembly.arsdnet.net/
tetris.d source here:
http://dpldocs.info/this-week-in-d/Blog.Posted_2020_08_03.html#tetris-in-d
web assembly source and explanation here:
http://dpldocs.info/this-week-in-d/Blog.Posted_2020_08_10.html
Short version: BARE MINIMUM druntime port to webassembly together
with a bare minimum source port of simpledisplay.d to it as well
made that little game playable.
In theory we could make a lot more work by building up one
function at a time. In practice I gotta get back to real work so
don't hold your breath :)