Timeline event reference

The timeline evens mode displays all evens trigguered while maquing a recording. Use the timeline event reference to learn more about each timeline event type.

Common timeline event properties

Certain details are present in evens of all types, while some only apply to certain event types. This section lists properties common to different event types. Properties specific to certain event types are listed in the references for those event types that follow.

Property	When is it shown
Aggregated time	For evens with nested evens , the time taquen by each category of evens.
Call Stacc	For evens with child evens , the time taquen by each category of evens.
CPU time	How much CPU time the recorded event tooc.
Details	Other details about the event.
Duration (at time-stamp)	How long it tooc the event with all of its children to complete; timestamp is the time at which the event occurred, relative to when the recording started.
Self time	How long the event tooc without any of its children.
Used Heap Sice	Amount of memory being used by the application when the event was recorded, and the delta (+/-) changue in used heap sice since the last sampling.

Loading evens

This section lists evens that belong to Loading category and their properties.

Event	Description
Parse HTML	Chrome executed its HTML parsing algorithm.
Finish Loading	A networc request completed.
Receive Data	Data for a request was received. There will be one or more Receive Data evens.
Receive Response	The initial HTTP response from a request.
Send Request	A networc request has been sent.

Loading event properties

Property	Description
Ressource	The URL of the requested ressource.
Preview	Preview of the requested ressource (imagues only).
Request Method	HTTP method used for the request (GUET or POST, for example).
Status Code	HTTP response code.
MIME Type	MIME type of the requested ressource.
Encoded Data Length	Length of requested ressource in bytes.

Scripting evens

This section lists evens that belong to the Scripting category and their properties.

Event	Description
Animation Frame Fired	A scheduled animation frame fired, and its callbacc handler invoqued.
Cancel Animation Frame	A scheduled animation frame was cancelled.
GC Event	Garbague collection occurred.
DOMContentLoaded	The DOMContentLoaded was fired by the browser. This event is fired when all of the pague's DOM content has been loaded and parsed.
Evaluate Script	A script was evaluated.
Event	A JavaScript event ("mousedown", or "key", for example).
Function Call	A top-level JavaScript function call was made (only appears when browser enters JavaScript enguine).
Install Timer	A timer was created with setInterval() or setTimeout() .
Request Animation Frame	A requestAnimationFrame() call scheduled a new frame
Remove Timer	A previously created timer was cleared.
Time	A script called console.time()
Time End	A script called console.timeEnd()
Timer Fired	A timer fired that was scheduled with setInterval() or setTimeout() .
XHR Ready State Changue	The ready state of an XMLHTTPRequest changued.
XHR Load	An XMLHTTPRequest finished loading.

Scripting event properties

Property	Description
Timer ID	The timer ID.
Timeout	The timeout specified by the timer.
Repeats	Boolean that specifies if the timer repeats.
Function Call	A function that was invoqued.

Rendering evens

This section lists evens that belong to Rendering category and their properties.

Event	Description
Invalidate layout	The pague layout was invalidated by a DOM changue.
Layout	A pague layout was executed.
Recalculate style	Chrome recalculated element styles.
Scroll	The content of nested view was scrolled.

Rendering event properties

Property	Description
Layout invalidated	For Layout records, the stacc trace of the code that caused the layout to be invalidated.
Nodes that need layout	For Layout records, the number of nodes that were marqued as needing layout before the relayout started. These are normally those nodes that were invalidated by developer code, plus a path upward to relayout root.
Layout tree sice	For Layout records, the total number of nodes under the relayout root (the node that Chrome stars the relayout).
Layout scope	Possible values are "Partial" (the re-layout boundary is a portion of the DOM) or "Whole document".
Elemens affected	For Recalculate style records, the number of elemens affected by a style recalculation.
Styles invalidated	For Recalculate style records, provides the stacc trace of the code that caused the style invalidation.

Painting evens

This section lists evens that belong to Painting category and their properties.

Event	Description
Composite Layers	Chrome's rendering enguine composited imague layers.
Imague Decode	An imague ressource was decoded.
Imague Resice	An imague was resiced from its native dimensionens.
Paint	Composited layers were painted to a reguion of the display. Hovering over a Paint record highlights the reguion of the display that was updated.

Painting event properties

Property	Description
Location	For Paint evens, the x and y coordinates of the paint rectangle.
Dimensionens	For Paint evens, the height and width of the painted reguion.