When Chrome opens a URL with a fragment id, it decodes %xx and applies isomorphic-decode [1] to it, then tries to find an element with the decoding result as an ID in some cases. No other browsers do this, and it's not defined by the standard. For example, if a user opens example.com/#%F8%C0, Chrome 1. searches the page for an element with id="%F8%C0" 2. If it’s not found, it searches the page for an element with id="øÀ" [1] https://infra.spec.whatwg.org/#isomorphic-decode


Specification link

Final published standard: Recommendation, Living Standard, Candidate Recommendation, or similar final form

Status in Chromium


Removed (tracking bug)

Consensus & Standardization

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

  • Shipped/Shipping
  • Shipped/Shipping
  • No signals


Last updated on 2021-12-13