Trying to convert small pixel font with disabled antialias results into antialiased sprite (with half-alpha pixels) :(
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It's no longer possible to disable antialiasing in browsers, as browsers have abandoned this feature. You can try using Firefox by enabling gfx.text.disable-aa in the settings (requires a restart), and that seems to work. But it's a very poor solution. If someone needs to disable antialiasing, they should look for an application other than one based on browser technologies.