Intent to Implement: Performance Observer API
Michael Blain
Contact emails
m...@chromium.org, igri...@chromium.org, nd...@chromium.org
Spec
http://w3c.github.io/performance-timeline/#the-performance-observer-interface
Summary
Performance Observer is a new interface to the Performance Timeline [http://w3c.github.io/performance-timeline] which allows a callback function to be invoked when there are new performance events added matching a certain criteria.
Motivation
The Performance Timeline does not work well in a shared environment. Because it is one global buffer, any user of the timeline may clear events or change the buffer size which could impact other simultaneous users. For Frame Timing [http://w3c.github.io/frame-timing] in particular, the potentially large volume of events makes a (small) shared buffer problematic.
Compatibility Risk
Low. There have been several discussions about this API on the W3C Web Perf working group mailing list and conference calls. There is general consensus that this API is the correct step forwards.
Ongoing technical constraints
None.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
OWP launch tracking bug?
Link to entry on the feature dashboard
http://www.chromestatus.com/features/5945504202489856
Requesting approval to ship?
No.