On macOS in Google Chrome, and not Safari, when window.devicePixelRatio === 1 some of the sidebar nav items at depth >=2 can appear blurry.
It appears this bug does not occur when window.devicePixelRatio === 2, which is true on Apple “Retina” monitors, e.g.
I suspect this may be browser rendering bug and/or a CSS transform rounding bug since it occurs in Google Chrome but not Safari, and blurriness due to half-pixel rounding when a CSS transform is applied is a common issue.