Webfont issues

[r12a]

The CSS styling for .exampleChar currently says:

exampleChar {
    font-size: 36pt;
    font-family: "Palatino", "Times", "Times New Roman", "Verdana", "NoToFu", serif;
}

which for me yields:

It should say:

exampleChar {
    font-size: 36pt;
    font-family: "NoToFu", "Palatino", "Times", "Times New Roman", "Verdana", serif;
}

which then gives a much more satisfactory results by actually illustrating the point you're trying to make, ie. that it's impossible to see the difference.

[r12a]

Second problem is that the Khmer text isn't combining as needed. It should look like this in Noto Sans Khmer.

I suspect you forgot to include the glyphs in your NoToFu webfont.

[aphillips]

This should mostly be addressed. The subset font itself isn't updated yet, but I moved NoToFu up in the fallback chain for examples and I added a WOFF font for Khmer to the stylesheet.