The MouseEvent.ctrlKey read-only property returns a Boolean that indicates if the control key was pressed (true) or not (false) when the event occured.
The MouseEvent.region read-only property returns the id of the canvas hit region affected by the event. If no hit region is affected, null is returned.
The NonDocumentTypeChildNode.previousElementSibling read-only property returns the Element immediately prior to the specified one in its parent's children list, or null if the specified element is the first one in the list.
The PerformanceNavigation.redirectCount read-only property returns an unsigned short representing the number of REDIRECTs done before reaching the page.
The PerformanceTiming.connectStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, where the request to open a connection is sent to the network. If the transport layer reports an error and the connection establishment is started again, the last connection establisment start time is given. If a persistent connection is used, the value will be the same as PerformanceTiming.fetchStart.
The PerformanceTiming.domainLookupStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, where the domain lookup starts. If a persistent connection is used, or the information is stored in a cache or a local resource, the value will be the same as PerformanceTiming.fetchStart.
The PerformanceTiming.domComplete read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, when the parser finished its work on the main document, that is when its Document.readyState changes to 'complete' and the corresponding readystatechange event is thrown.
The PerformanceTiming.domContentLoadedEventEnd read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, right after all the scripts that need to be executed as soon as possible, in order or not, has been executed.
The PerformanceTiming.domContentLoadedEventStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, right before the parser sent the DOMContentLoaded event, that is right after all the scripts that need to be executed right after parsing has been executed.
The PerformanceTiming.domInteractive read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, when the parser finished its work on the main document, that is when its Document.readyState changes to 'interactive' and the corresponding readystatechange event is thrown.