Allows developers to selectively enable and disable use of synchronous script execution through the feature policy HTTP header or the <iframe> "allow" attribute. The identifier for the feature in policies is "sync-script". By default, synchronous script execution is allowed in all frames. If developers wish to disable this on any page, they can include a header like: Feature-Policy: sync-script 'none'

Documentation

Status in Chromium

Blink>FeaturePolicy


In development (tracking bug)

Consensus & Standardization

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

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  • No signal
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  • No signals

Owner

Last updated on 2021-05-09