Earlier quoted context omitted.
But as a web developer I don't necessarily care about standards. I want the page to work for as many users as possible. For the longest time this meant to support IE's way of doing things, now it means to support Chrome (unless you target Enterprise users). Even if you develop for Chrome, Firefox and Edge you'll just end up building workarounds for all 3, not adhering strictly to the standard.
Sorry to break this to you, but as a web developer you should only care about standards, otherwise you have no standards. The standards are a single source of truth for your production, if you build solely to a single browsers quirks (in this case Chrome) then those quirks can change at any time.
A web developer codes against real machines, not the imagined, idealized, and non-existent machines the specs describe.