Changes between v1.21.9 and v1.21.10:
b76dde7 Fix html export keyboard event handling to support semicolon, minus, equals, and left/right Mac command keys. (thanks jminor)
b4a78ea Fixed command key in Firefox. (thanks jminor)
683ee92 Add support for highdpi in html exports. (thanks jminor)
ab9387d fix segfault when resizing a framebuffer