Chrome DevTools Protocol

Methods

PerformanceTimeline.enable #

Previously buffered events would be reported before method returns. See also: timelineEventAdded

parameters

eventTypes: array[ string ]

The types of event to report, as specified in https://w3c.github.io/performance-timeline/#dom-performanceentry-entrytype The specified filter overrides any previous filters, passing empty filter disables recording. Note that not all types exposed to the web platform are currently supported.

Events

PerformanceTimeline.timelineEventAdded #

Sent when a performance timeline event is added. See reportPerformanceTimeline method.

parameters

event: TimelineEvent

Types

PerformanceTimeline.LargestContentfulPaint #

See https://github.com/WICG/LargestContentfulPaint and largest_contentful_paint.idl

Type: object

properties

renderTime: Network.TimeSinceEpoch
loadTime: Network.TimeSinceEpoch
size: number

The number of pixels being painted.
elementId: string

The id attribute of the element, if available.
url: string

The URL of the image (may be trimmed).
nodeId: DOM.BackendNodeId

PerformanceTimeline.LayoutShift #

See https://wicg.github.io/layout-instability/#sec-layout-shift and layout_shift.idl

Type: object

properties

value: number

Score increment produced by this event.
hadRecentInput: boolean
lastInputTime: Network.TimeSinceEpoch
sources: array[ LayoutShiftAttribution ]

PerformanceTimeline.LayoutShiftAttribution #

Type: object

properties

previousRect: DOM.Rect
currentRect: DOM.Rect
nodeId: DOM.BackendNodeId

PerformanceTimeline.TimelineEvent #

Type: object

properties

frameId: Page.FrameId

Identifies the frame that this event is related to. Empty for non-frame targets.
type: string

The event type, as specified in https://w3c.github.io/performance-timeline/#dom-performanceentry-entrytype This determines which of the optional "details" fields is present.
name: string

Name may be empty depending on the type.
time: Network.TimeSinceEpoch

Time in seconds since Epoch, monotonically increasing within document lifetime.
duration: number

Event duration, if applicable.
lcpDetails: LargestContentfulPaint
layoutShiftDetails: LayoutShift