Oops you're right about that typo Although for css cm, browsers will use 37.8 px/cm instead of 96/2.54=37.7952 when making the conversion which gives the even

Oops you're right about that typo Although for css cm, browsers will use 37.8 px/cm instead of 96/2.54=37.7952 when making the conversion which gives the even 284000cm The only way I can think of to get 18.94 km from the browser's interpreted 2.84 km is if the website is physically projected/printed on a 14.4 dpi display like a billboard