Intent to Remove: Prefixed Resource Timing buffer-management API

[Kunihiko Sakamoto‏]

Primary eng (and PM) emails

ksak...@chromium.org

Link to “Intent to Deprecate” thread

No deprecate thread; a deprecation message was added as part of the Intent to ship unprefixed Resource Timing API.

Summary

Remove webkitClearResourceTimings(), webkitSetResourceTimingBufferSize(), and onwebkitresourcetimingbufferfull from the Performance interface, in favor of clearResourceTimings(), setResourceTimingBufferSize(), and onresourcetimingbufferfull.

Motivation

This aligns ResourceTiming with the specification and Chrome’s general desire of not using prefixed features anymore.

Compatibility Risk

Low.

The webkit-prefixed APIs have been supported since Chrome 25 (Feb 2013). It was originally implemented in WebKit, but Safari has not enabled it. Firefox, IE 10+, and Edge have only unprefixed version of the API.

Deprecation message has been around for a long time, since Chrome 46 (Oct 2015).

Usage information from UseCounter

PrefixedPerformanceClearResourceTimings: 0.006%

PrefixedPerformanceSetResourceTimingBufferSize: 0.001%

PrefixedPerformanceResourceTimingBufferFull: 0.025%

The usage of onresourcetimingbufferfull is probably inflated since it's measuring any access to the attribute (not when events are actually fired).

OWP launch tracking bug

https://crbug.com/678547

Entry on the feature dashboard

https://www.chromestatus.com/feature/5688905986736128

[Ilya Grigorik‏]

\o/ .. yay! 

[Dimitri Glazkov‏]

LGTM1

[Chris Harrelson‏]

LGTM2

LGTM1

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[PhistucK‏]

I thought there was an "Alternatives for web developers" section in the intent template, or is it only in the intent to deprecate template?

I know the summary already states it, but it is better to spell it out in its own section (and on ChromeStatus) for easier look up for web developers.

☆PhistucK

[Kunihiko Sakamoto‏]

Yeah the alternatives section was only in the intent-to-deprecate template.

For this case, alternatives are the unprefixed buffer-management API:

• performance.clearResourceTimings()
  
• performance.setResourceTimingBufferSize()
  
• performance.onresourcetimingbufferfull
  

[Rick Byers‏]

LGTM3