The stale-while-revalidate attribute is used by the Cache-Control header and defines an extra window of time during which a cache (proxy, user agents) can use a stale asset while it revalidates it asynchronously. This improves subsequent page load latencies as stale assets are non longer in the critical path.
Specification currently under development in a Working Group
Status in Chromium
Enabled by default
Consensus & Standardization
- No signal
Intent to Prototype urlIntent to Prototype thread
Last updated on 2021-12-13