Jekyll2026-05-24T01:11:00+00:00https://rixx.github.io/baseline-updates/feed/by_tag/performance.xmlUpdates to the Baseline collection. Including RSS feeds (both for all updates and individual tags).2025-12-12T00:00:00+00:002025-12-12T00:00:00+00:00https://rixx.github.io/baseline-updates/2025/12/12/event-timingcaniuse · mdn · spec

The event and first-input performance entries and the PerformanceEventTiming API measures the latency of user input events, such as mouse clicks or keypresses. They’re used to calculate Interaction to Next Paint (INP), a common metric for perceived responsiveness.

Source features

• api.PerformanceEventTiming [mdn]
• api.PerformanceEventTiming.cancelable [mdn]
• api.PerformanceEventTiming.processingEnd [mdn]
• api.PerformanceEventTiming.processingStart [mdn]
• api.PerformanceEventTiming.toJSON [mdn]
• api.EventCounts [mdn]
• api.EventCounts.@@iterator [mdn]
• api.EventCounts.entries [mdn]
• api.EventCounts.forEach [mdn]
• api.EventCounts.get [mdn]
• api.EventCounts.has [mdn]
• api.EventCounts.keys [mdn]
• api.EventCounts.size [mdn]
• api.EventCounts.values [mdn]
• api.Performance.eventCounts [mdn]
• api.PerformanceEventTiming.target [mdn]
• api.PerformanceEventTiming.interactionId [mdn]

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2025-12-12T00:00:00+00:002025-12-12T00:00:00+00:00https://rixx.github.io/baseline-updates/2025/12/12/largest-contentful-paintcaniuse · mdn · spec

The largest-contentful-paint performance entry and the LargestContentfulPaint API measures the time it takes for the largest image or text to appear. Largest contentful paint (LCP) is a common metric for perceived loading times.

Source features

• api.LargestContentfulPaint [mdn]
• api.LargestContentfulPaint.element [mdn]
• api.LargestContentfulPaint.id [mdn]
• api.LargestContentfulPaint.loadTime [mdn]
• api.LargestContentfulPaint.renderTime [mdn]
• api.LargestContentfulPaint.size [mdn]
• api.LargestContentfulPaint.toJSON [mdn]
• api.LargestContentfulPaint.url [mdn]

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2025-09-27T00:00:00+00:002025-09-27T00:00:00+00:00https://rixx.github.io/baseline-updates/2025/09/27/resource-sizecaniuse · mdn · [spec]([‘https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-decodedbodysize’, ‘https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-encodedbodysize’, ‘https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersize’])

The decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.

Source features

• api.PerformanceResourceTiming.decodedBodySize [mdn]
• api.PerformanceResourceTiming.encodedBodySize [mdn]
• api.PerformanceResourceTiming.transferSize [mdn]

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2025-09-27T00:00:00+00:002025-09-27T00:00:00+00:00https://rixx.github.io/baseline-updates/2025/09/27/server-timingcaniuse · mdn · spec

The serverTiming property of the PerformanceResourceTiming API contains server timing information about network requests.

Source features

• api.PerformanceResourceTiming.serverTiming [mdn]
• api.PerformanceServerTiming [mdn]
• api.PerformanceServerTiming.description [mdn]
• api.PerformanceServerTiming.duration [mdn]
• api.PerformanceServerTiming.name [mdn]
• api.PerformanceServerTiming.toJSON [mdn]
• http.headers.Server-Timing [mdn]
• http.headers.Server-Timing.trailer [mdn]

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2024-04-25T00:00:00+00:002024-04-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/04/25/navigation-timingcaniuse · mdn · spec

The navigation performance entry and the PerformanceNavigationTiming API measures navigation events, such as loading time or the number of redirects.

Source features

• api.PerformanceNavigationTiming [mdn]
• api.PerformanceNavigationTiming.domComplete [mdn]
• api.PerformanceNavigationTiming.domContentLoadedEventEnd [mdn]
• api.PerformanceNavigationTiming.domContentLoadedEventStart [mdn]
• api.PerformanceNavigationTiming.domInteractive [mdn]
• api.PerformanceNavigationTiming.loadEventEnd [mdn]
• api.PerformanceNavigationTiming.loadEventStart [mdn]
• api.PerformanceNavigationTiming.redirectCount [mdn]
• api.PerformanceNavigationTiming.type [mdn]
• api.PerformanceNavigationTiming.unloadEventEnd [mdn]
• api.PerformanceNavigationTiming.unloadEventStart [mdn]
• api.PerformanceNavigationTiming.toJSON [mdn]
• api.PerformanceNavigationTiming.criticalCHRestart [mdn]

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2023-10-26T00:00:00+00:002023-10-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2023/10/26/paint-timingcaniuse · mdn · spec

The paint performance entry and the PerformancePaintTiming API measures the duration of “paint” (also called “render”) operations as a page loads. The API measures the time to First Paint (FP) and First Contentful Paint (FCP), common metrics for perceived loading times.

Source features

• api.PerformancePaintTiming [mdn]
• api.PerformancePaintTiming.first-contentful-paint [mdn]
• api.PerformancePaintTiming.toJSON [mdn]
• api.PerformancePaintTiming.first-paint [mdn]

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2021-10-25T00:00:00+00:002021-10-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/10/25/navigation-timingcaniuse · mdn · spec

The navigation performance entry and the PerformanceNavigationTiming API measures navigation events, such as loading time or the number of redirects.

Source features

• api.PerformanceNavigationTiming [mdn]
• api.PerformanceNavigationTiming.domComplete [mdn]
• api.PerformanceNavigationTiming.domContentLoadedEventEnd [mdn]
• api.PerformanceNavigationTiming.domContentLoadedEventStart [mdn]
• api.PerformanceNavigationTiming.domInteractive [mdn]
• api.PerformanceNavigationTiming.loadEventEnd [mdn]
• api.PerformanceNavigationTiming.loadEventStart [mdn]
• api.PerformanceNavigationTiming.redirectCount [mdn]
• api.PerformanceNavigationTiming.type [mdn]
• api.PerformanceNavigationTiming.unloadEventEnd [mdn]
• api.PerformanceNavigationTiming.unloadEventStart [mdn]
• api.PerformanceNavigationTiming.toJSON [mdn]
• api.PerformanceNavigationTiming.criticalCHRestart [mdn]

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2021-04-26T00:00:00+00:002021-04-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/04/26/paint-timingcaniuse · mdn · spec

The paint performance entry and the PerformancePaintTiming API measures the duration of “paint” (also called “render”) operations as a page loads. The API measures the time to First Paint (FP) and First Contentful Paint (FCP), common metrics for perceived loading times.

Source features

• api.PerformancePaintTiming [mdn]
• api.PerformancePaintTiming.first-contentful-paint [mdn]
• api.PerformancePaintTiming.toJSON [mdn]
• api.PerformancePaintTiming.first-paint [mdn]

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2018-03-16T00:00:00+00:002018-03-16T00:00:00+00:00https://rixx.github.io/baseline-updates/2018/03/16/performancecaniuse · mdn · [spec]([‘https://w3c.github.io/hr-time/’, ‘https://w3c.github.io/performance-timeline/’, ‘https://w3c.github.io/resource-timing/’, ‘https://w3c.github.io/user-timing/#extensions-performance-interface’])

The performance global object and the Performance API provide access to performance-related information for the current execution context.

Source features

• api.Performance [mdn]
• api.performance [mdn]
• api.Performance.now [mdn]
• api.PerformanceMeasure [mdn]
• api.Performance.getEntries [mdn]
• api.Performance.getEntriesByName [mdn]
• api.Performance.getEntriesByType [mdn]
• api.PerformanceMark [mdn]
• api.Performance.mark [mdn]
• api.Performance.measure [mdn]
• api.Performance.clearMarks [mdn]
• api.Performance.clearMeasures [mdn]
• api.performance.worker_support [mdn]
• api.Performance.clearResourceTimings [mdn]
• api.Performance.setResourceTimingBufferSize [mdn]
• api.PerformanceEntry [mdn]
• api.PerformanceEntry.duration [mdn]
• api.PerformanceEntry.entryType [mdn]
• api.PerformanceEntry.name [mdn]
• api.PerformanceEntry.startTime [mdn]
• api.PerformanceEntry.toJSON [mdn]
• api.PerformanceEntry.worker_support [mdn]
• api.Performance.resourcetimingbufferfull_event [mdn]
• api.PerformanceObserver [mdn]
• api.PerformanceObserver.PerformanceObserver [mdn]
• api.PerformanceObserver.disconnect [mdn]
• api.PerformanceObserver.observe [mdn]
• api.PerformanceObserverEntryList [mdn]
• api.PerformanceObserverEntryList.getEntries [mdn]
• api.PerformanceObserverEntryList.getEntriesByName [mdn]
• api.PerformanceObserverEntryList.getEntriesByType [mdn]
• http.headers.Timing-Allow-Origin [mdn]
• api.PerformanceObserver.worker_support [mdn]
• api.PerformanceObserver.supportedEntryTypes_static [mdn]
• api.Performance.toJSON [mdn]
• api.Performance.timeOrigin [mdn]
• api.PerformanceObserver.takeRecords [mdn]
• api.PerformanceMark.PerformanceMark [mdn]
• api.Performance.mark.markOptions_parameter [mdn]
• api.Performance.mark.returns_performancemark [mdn]
• api.PerformanceMark.detail [mdn]
• api.Performance.measure.measureOptions_parameter [mdn]
• api.Performance.measure.returns_performancemeasure [mdn]
• api.PerformanceMeasure.detail [mdn]
• api.PerformanceObserver.PerformanceObserver.droppedEntriesCount [mdn]

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2015-09-16T00:00:00+00:002015-09-16T00:00:00+00:00https://rixx.github.io/baseline-updates/2015/09/16/performancecaniuse · mdn · [spec]([‘https://w3c.github.io/hr-time/’, ‘https://w3c.github.io/performance-timeline/’, ‘https://w3c.github.io/resource-timing/’, ‘https://w3c.github.io/user-timing/#extensions-performance-interface’])

The performance global object and the Performance API provide access to performance-related information for the current execution context.

Source features

• api.Performance [mdn]
• api.performance [mdn]
• api.Performance.now [mdn]
• api.PerformanceMeasure [mdn]
• api.Performance.getEntries [mdn]
• api.Performance.getEntriesByName [mdn]
• api.Performance.getEntriesByType [mdn]
• api.PerformanceMark [mdn]
• api.Performance.mark [mdn]
• api.Performance.measure [mdn]
• api.Performance.clearMarks [mdn]
• api.Performance.clearMeasures [mdn]
• api.performance.worker_support [mdn]
• api.Performance.clearResourceTimings [mdn]
• api.Performance.setResourceTimingBufferSize [mdn]
• api.PerformanceEntry [mdn]
• api.PerformanceEntry.duration [mdn]
• api.PerformanceEntry.entryType [mdn]
• api.PerformanceEntry.name [mdn]
• api.PerformanceEntry.startTime [mdn]
• api.PerformanceEntry.toJSON [mdn]
• api.PerformanceEntry.worker_support [mdn]
• api.Performance.resourcetimingbufferfull_event [mdn]
• api.PerformanceObserver [mdn]
• api.PerformanceObserver.PerformanceObserver [mdn]
• api.PerformanceObserver.disconnect [mdn]
• api.PerformanceObserver.observe [mdn]
• api.PerformanceObserverEntryList [mdn]
• api.PerformanceObserverEntryList.getEntries [mdn]
• api.PerformanceObserverEntryList.getEntriesByName [mdn]
• api.PerformanceObserverEntryList.getEntriesByType [mdn]
• http.headers.Timing-Allow-Origin [mdn]
• api.PerformanceObserver.worker_support [mdn]
• api.PerformanceObserver.supportedEntryTypes_static [mdn]
• api.Performance.toJSON [mdn]
• api.Performance.timeOrigin [mdn]
• api.PerformanceObserver.takeRecords [mdn]
• api.PerformanceMark.PerformanceMark [mdn]
• api.Performance.mark.markOptions_parameter [mdn]
• api.Performance.mark.returns_performancemark [mdn]
• api.PerformanceMark.detail [mdn]
• api.Performance.measure.measureOptions_parameter [mdn]
• api.Performance.measure.returns_performancemeasure [mdn]
• api.PerformanceMeasure.detail [mdn]
• api.PerformanceObserver.PerformanceObserver.droppedEntriesCount [mdn]

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