The Web Performance Working Group has published two Working Drafts:

  • User Timing Level 2: This specification defines an interface to help web developers measure the performance of their applications by giving them access to high precision timestamps.
  • High Resolution Time Level 3: This specification defines an API that provides the current time in sub-millisecond resolution and such that it is not subject to system clock skew or adjustments.

Publication – W3C News

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