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Add Chrome DevTools Extensibility API #28270
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caugner
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Oct 28, 2025
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Summary
The Chrome DevTools extensibility API adds some optional extra params to User Timing (
performance.markandperformance.measure) andconsole.timestampto provide additional information to performance traces.I\m looking to document these in mdn/content#41372 and so adding BCD data here.
Test results and supporting details
User Timing supported from 128 - https://developer.chrome.com/blog/new-in-devtools-128#perf-extension
Console.timesstamp supported from 134 https://developer.chrome.com/blog/new-in-devtools-134#console-timestamp
Spec discussions:
detailparam that allows developers to customize the presentation of timings in devtools w3c/user-timing#111Note I've marked it as
"standard_track": falsefor now, since those discussions are ongoing.Related issues
MDN content PR: mdn/content#41372