Resource-Timing

Resource Timing defines an interface for web applications to access the complete timing information for resources in a document.

• Level 3 / Editors Draft: https://w3c.github.io/resource-timing/
• Level 2: https://www.w3.org/TR/resource-timing-2/
• Level 1: https://www.w3.org/TR/resource-timing/

See also Web performance README