Examples:

• Using the Resource Timing API interface. This Web app is described in MDN’s Using the Resource Timing API guide. It shows basic usage of the Resource Timing standard’s interfaces.
• Using the User Timing API interface. This Web app is described in MDN’s Using the User Timing API guide. It shows basic usage of the User Timing standard’s interfaces.

Interoperability:

• Check Browser’s Web Performance API support. This app gives the browser’s Yes/No support of Web Performance APIs. Several APIs and specs are covered with more to come (PRs welcomed and encouraged!).