> for some reason the fi ligature is huge compared to the rest of the text They're using the Unicode "presentation-forms" ligature character "fi" in the text (w

> for some reason the fi ligature is huge compared to the rest of the text They're using the Unicode "presentation-forms" ligature character "fi" in the text (which is not recommended: just spell the text normally with "fi", and leave it to fonts to generate a ligature glyph if appropriate); but then they've specified a webfont resource (Crimson Text) that doesn't support it. So the browser falls back to the next available font for that character, which may be a poor visual match.