The Node.firstChild read-only property returns the node's first child in the tree, or null if the node is childless. If the node is a Document, it returns the first node in the list of its direct children.
The Node.nextSibling read-only property returns the node immediately following the specified one in its parent's childNodes list, or null if the specified node is the last node in that list.
The Node.parentElement read-only property returns the DOM node's parent Element, or null if the node either has no parent, or its parent isn't a DOM Element.
The timestamp read-only property of the Notification interface returns a DOMTimeStamp, as specified in the timestamp option of the Notification() constructor.
The onresourcetimingbufferfull property is an event handler that will be called when the resourcetimingbufferfull event is fired. This event is fired when the browser's resource timing performance buffer is full.
The domComplete property returns a timestamp representing the time value equal to the time immediately before the user agent sets the current document readiness of the current document to complete.
The domContentLoadedEventEnd property returns a timestamp representing the time value equal to the time immediately after the current document's DOMContentLoaded event completes.
The domContentLoadedEventStart property returns a timestamp representing the time value equal to the time immediately before the user agent fires the DOMContentLoaded event at the current document.
The domInteractive property returns a timestamp representing the time value equal to the time immediately before the user agent sets the current document readiness of the current document to interactive.