Limited Availability Performance

Soft navigation performance entries

A soft-navigation performance entry measures the duration of a soft navigation in a single page app. A soft navigation is defined as when a trusted user interaction causes a URL update and a visible contentful paint to the screen.

Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Jul 31, 2026.

Desktop Browser Engine Support

Google Chrome

151

Supported

Mozilla Firefox

—

Unsupported

Apple Safari

—

Unsupported

Microsoft Edge

151

Supported

Mobile Browser Engine Support

Chrome Android

151

Firefox Android

—

Safari iOS

—

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.PerformanceSoftNavigation ↗ api.PerformanceSoftNavigation.getLargestInteractionContentfulPaint ↗ api.PerformanceSoftNavigation.interactionId ↗ api.PerformanceSoftNavigation.navigationType ↗ api.PerformanceSoftNavigation.paintTime ↗ api.PerformanceSoftNavigation.presentationTime ↗ api.PerformanceSoftNavigation.toJSON ↗