Fat E
I'm probably focusing more on fonts lately because I'm 'building' a Poser model of a printshop. Still,
this oddity would have caught my attention anyway.
Look at the E. It's the same at other zoom factors. This sort of thing used to happen often on typewriters, but it was nearly impossible in hot lead. You'd have to pull out all the E's from your case (or your matrix cartridge) and put in E's from a bolder font. Could happen but highly unlikely.
In HTML and CSS it's all up to the font definition itself. Looking at the underlying page, deep in some JS that builds a CSS form to match the browser specs, two fonts are mentioned: ElizabethSerif and ProximaNovaCondensed. Neither is present on my computer, so presumably it's using an available font that fits the family and serif choices. I've never seen this fat E in any font I use for editing. Looking online, Elizabeth Serif is a pretty Antique font, but it doesn't have fat Es. Proxima is a modern Helveticaish thing, completely unrelated.