DPR, Width, and Viewport-Width hints enable proactive content negotiation between client and server, enabling automated delivery of optimized assets - e.g. auto-negotiating image DPR resolution, image size, and other optimized assets based on signals such as client's viewport width. For more detail, see: https://docs.google.com/document/d/1SnRhnR_oWQ4Rivb7InJ9a_0T2k9CnuhNcMkd9xtLrKY/edit and https://github.com/igrigorik/http-client-hints#use-cases




Editor's draft

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 46
  • Chrome for Android release 46
  • Chrome for iOS release 46
  • Android WebView release 46

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Last updated on 2020-11-19