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core-js adoption & performance trends

2 quarters of aggregate data

Unique domains per quarter

core-js -- Unique domains per quartercore-js -- Unique domains per quarter0410.3820.61230.91641.2Q2 '26Q3 '26

Median composite score

core-js -- Median composite scorecore-js -- Median composite score0255075100Q2 '26Q3 '26

Median Lighthouse performance

core-js -- Median Lighthouse performancecore-js -- Median Lighthouse performance0255075100Q2 '26Q3 '26

Median Lighthouse accessibility

core-js -- Median Lighthouse accessibilitycore-js -- Median Lighthouse accessibility0255075100Q2 '26Q3 '26

How this is calculated

Each point is the median across all public core-js audits completed that quarter. Quarters with fewer than 3 audits are skipped.

Learn more about our methodology →

Raw data

QuarterUnique domainsCompositePerformanceAccessibility
Q2 '261492723688
Q3 '2610794089