png-font.js

  png_font.setup(
    document.getElementById("target").getContext("2d"),
    "img/unifont.png",
    function(){
      png_font.drawText("hello world!", [32,32]);
      png_font.drawText("한국어!", [48,64],"#559");
      png_font.drawText("日本語!", [64,96],"red",2);
      png_font.drawText("Café",[160,40],'orange',4,'blue')
  });

which font is this?

The image font used here is the GNU Unifont! You can read more about in the website, which is mantained by the awesome Paul Hardy: unifoundry.com .