If the current context is a worker, the workerStart property returns a timestamp immediately before the worker that fetches the resource is started. If the context is not a worker (i.e. a browser context), this property returns zero.
The Position.coords read-only property, a Coordinates object, represents a geographic attitude: it contains the location, that is longitude and latitude on the Earth, the altitude, and the speed of the object concerned, regrouped inside the returned value. It also contains accuracy information about these values.
The Position.timestamp read-only property, a DOMTimeStamp object, represents the date and the time of the creation of the Position object it belongs to. The precision is to the millisecond.
The ProgressEvent.lengthComputable read-only property is a Boolean flag indicating if the resource concerned by the ProgressEvent has a length that can be calculated. If not, the ProgressEvent.total property has no significant value.
The ProgressEvent.loaded read-only property is an unsigned long long representing the amount of work already performed by the underlying process. The ratio of work done can be calculated with the property and ProgressEvent.total. When downloading a resource using HTTP, this only represent the part of the content itself, not headers and other overhead.
The SVGAElement.target read-only property of SVGAElement returns an SVGAnimatedString object that specifies the portion of a target window, frame, pane into which a document is to be opened when a link is activated.