Browser Media Queries with EM are consistently accessible

In Best Practice, Engineering by Fredy Ore

Zell Liew has written a great blog post on why Browser Media Queries that use EM instead of PX, REM for breakpoints is the only unit that performs consistently across all browsers for:

  1. Font size changes in HTML font-size
  2. User Zoom In/Outs
  3. Changed default browser font sizes

Update: There is a great 2020 article which covers changes since 2016.