Without adjust

serif sans-serif monospace congue massa. Fusce posuere, magna sed pulvinar ultricies.

With pixel adjust

serif sans-serif monospace congue massa. Fusce posuere, magna sed pulvinar ultricies.

With font-size-adjust

serif sans-serif monospace congue massa. Fusce posuere, magna sed pulvinar ultricies.

sans-serif: 20px * 0.444(Times New Roman) / 0.521(arial) = 17.04px

monospace: 20px * 0.444(Times New Roman) / 0.424(Courier New) = 20.9px