You can probably do something similar with javascript, either by comparing a <span>'s width, or by using canvas etc sampling pixels, to see if a given font is i

You can probably do something similar with javascript, either by comparing a <span>'s width, or by using canvas etc sampling pixels, to see if a given font is installed or not. You'd need a pretty long list of fonts to check, though. Flash makes it easier since you can simply enumerate all the fonts.