web api instance property
NotRestoredReasons: reasons property
Limited availability
The reasons read-only property of the
NotRestoredReasons interface returns an array of NotRestoredReasonDetails objects, each representing a reason why the navigated page was blocked from using the back/forward cache (bfcache).
Value
An array of NotRestoredReasonDetails objects. See Blocking reasons for a list of the possible blocking reasons.
If the document is in a cross-origin <iframe>, reasons will return null, but the parent document may show a reason of "masked" if any <iframe>s blocked bfcache usage for the top-level frame.
Examples
See Monitoring bfcache blocking reasons for examples.
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.