Intervention: Blocking the load of cross-origin, parser-blocking scripts inserted via document.write for users on 2G
For users on slow connections such as 2G, the performance penalty from third-party scripts loaded via document.write is often so severe as to delay display of main page content for tens of seconds. This feature will block the load of cross-origin, parser-blocking scripts inserted via document.write in case of an HTTP cache miss for users on a 2G connection. The feature will only be applicable to such scripts in the main frame.
Documentation
- https://developer.mozilla.org/en-US/docs/Web/API/Document/write
- https://github.com/WICG/interventions/issues/17
- https://docs.google.com/document/d/1dMJRQKTw75ZNdknP3pirSBH3koPl_IWHnxlcBuu4t_c/edit?usp=sharing
- https://docs.google.com/document/d/1FSegTIN91btRwPCIrt6s3X63cdOJmNjcr0p2mhlOAW8/edit?usp=sharing
- https://docs.google.com/document/d/1AtS83d9joGj-xmt_pZB4Uvvn_9d1aEReRg0rI_5runw/edit#
Status in Chromium
Enabled by default (launch bug) in:
- Chrome for desktop release 55
- Chrome for Android release 55
- Chrome for iOS release 55
- Android WebView release 55
- Opera release 55
- Opera for Android release 55
Consensus & Standardization
- No public signals
- No public signals
- No public signals
- Positive
Owners
Last updated on 2016-12-02
Comments
Launch slated for M55.