Add ActualNavigationStart-based metric for DOMContentLoaded [chromium/src : main]
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Minoru Chikamune (Gerrit)
Feb 19, 2026, 3:02:28 AM (yesterday) Feb 19
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Minoru Chikamune (Gerrit)
Feb 19, 2026, 3:06:21 AM (yesterday) Feb 19
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Takashi Toyoshima (Gerrit)
Feb 19, 2026, 3:50:32 AM (yesterday) Feb 19
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Minoru Chikamune (Gerrit)
Feb 19, 2026, 3:50:50 AM (yesterday) Feb 19
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Chromium LUCI CQ (Gerrit)
Feb 19, 2026, 3:57:25 AM (yesterday) Feb 19
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Change information
Commit message:
Add ActualNavigationStart-based metric for DOMContentLoaded
This CL introduces a new histogram to measure the duration from the
"actual" navigation start to the DOMContentLoaded event:
PageLoad.DocumentTiming.ActualNavigationStartToDOMContentLoadedEventFired
Similar to other ActualNavigationStart-based metrics (e.g., for FCP and
LCP), this metric measures the duration from the time the navigation is
actually initiated (which can be before beforeunload handlers run) to
when the DOMContentLoaded event is fired.
It excludes the time spent waiting for user interaction in beforeunload
dialogs but includes the time spent running the beforeunload JavaScript
handlers themselves. This provides a more comprehensive view of the page
load timeline starting from the user's initial action.
See also:
https://docs.google.com/document/d/1JihuzrpTbkGK0m2ST2bZE8LnTll-EoUCM24ahSqoV1M/edit?tab=t.0
Bug: 467158532
Bug: 476933703
Change-Id: I2845a87f728112e8b8d119b0c28bbd2547599cf7
Reviewed-by: Takashi Toyoshima <toyo...@chromium.org>
Commit-Queue: Minoru Chikamune <chik...@chromium.org>
Commit-Queue: Takashi Toyoshima <toyo...@chromium.org>
Auto-Submit: Minoru Chikamune <chik...@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1586954}
Files:
- M chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
- M components/page_load_metrics/browser/observers/core/uma_page_load_metrics_observer.cc
- M components/page_load_metrics/browser/observers/core/uma_page_load_metrics_observer.h
- M tools/metrics/histograms/metadata/page/histograms.xml
Change size: S
Delta: 4 files changed, 30 insertions(+), 2 deletions(-)
Branch: refs/heads/main
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Code-Review: +1 by Takashi Toyoshima
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