The best replacement for px is em.

The best alternatives to px are rated as following:
★★★★★  em
★★★★  pt
★★★  bx
★★  rem
★★  em css
★★  dp
★★  rx
★  em responsive design
★  commissary
★  dpi
★  pt font css
  dp android
  pt css
  pxi
  jrx
  vespa gt
  cdp
  ems
  lml

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Google Trends

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px
em
pt