One can use the Freetype library to render beautifully sharp text directly to a canvas with gamma-correct subpixel alpha coverage. Why this Rust website uses such blurry fonts, I don't know, it reminds me of playing an OpenGL/DirectX video game where the text is rendered using cached texture-filtered quads: maybe good enough for game UI, but not for intensive reading.

For those wondering why: subpixel rendering requires knowing the subpixel layout of the display. It’s something your OS knows, but your web browser doesn’t tell the website.

Also for those wondering how you can get subpixel AA on your canvases anyway: if you use a classic 2d rendering context (not WebGL), you can use canvas.getContext("2d", {alpha: false}) to create a canvas with a fully opaque background, which will also cause fillText to render with subpixel AA on most browsers.