How we built it

HTTP Client Hints: DPR, Width, Viewport-Width

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: and




Editor's draft

Status in Chromium

Enabled by default (launch bug) in:

  • Chrome for desktop release 46
  • Chrome for Android release 46
  • Chrome for iOS release 46
  • Android WebView release 46
  • Opera release 33
  • Opera for Android release 33

Consensus & Standardization


Last updated on 2015-10-16