The HTMLUListElement interface provides special properties (beyond those defined on the regular HTMLElement interface it also has available to it by inheritance) for manipulating unordered list elements.
The HTMLUnknownElement interface represents an invalid HTML element and derives from the HTMLElement interface, but without implementing any additional properties or methods.
The Location interface represents the location (URL) of the object it is linked to. Changes done on it are reflected on the object it relates to. Both the Document and Window interface have such a linked Location, accessible via Document.location and Window.location respectively.
The Location.reload() method reloads the resource from the current URL. Its optional unique parameter is a Boolean, which, when it is true, causes the page to always be reloaded from the server. If it is false or not specified, the browser may reload the page from its cache. Besides caching behaviour forcedReload flag also impacts how some browsers handle scroll position: ordinary reload happens to try to restore scroll position after reloading page DOM, while in forced mode (when parameter is set to true) the new DOM gets loaded with scrollTop == 0.
The Location.replace() method replaces the current resource with the one at the provided URL. The difference from the assign() method is that after using replace() the current page will not be saved in session History, meaning the user won't be able to use the back button to navigate to it.
The MessagePort interface of the Channel Messaging API represents one of the two ports of a MessageChannel, allowing sending of messages from one port and listening out for them arriving at the other.
The Navigator.vendorSub read-only property is the substring of the vendor having to do with the vendor version number. The specification allows browsers to always return the empty string, so don't rely on this property to get a reliable answer.
If the underlying element collection contains radio buttons, the RadioNodeList.value property represents the checked radio button. On retrieving the value property, the value of the currently checked radio button is returned as a string. If the collection does not contain any radio buttons or none of the radio buttons in the collection is in checked state, the empty string is returned. On setting the value property, the first radio button input element whose value property is equal to the new value will be set to checked.
The Selection.collapse() method collapses the current selection to a single point. The document is not modified. If the content is focused and editable, the caret will blink there.
The Selection.removeAllRanges() method removes all ranges from the selection, leaving the anchorNode and focusNode properties equal to null and leaving nothing selected.
The TimeRanges interface is used to represent a set of time ranges, primarily for the purpose of tracking which portions of media have been buffered when loading it for use by the <audio> and <video> elements.
The structured clone algorithm is a new algorithm defined by the HTML5 specification for serializing complex JavaScript objects. It's more capable than JSON in that it supports the serialization of objects that contain cyclic graphs — objects can refer to objects that refer to other objects in the same graph. In addition, in some cases, the structured clone algorithm may be more efficient than JSON.
A worker is an object created using a constructor (e.g. Worker()) that runs a named JavaScript file — this file contains the code that will run in the worker thread; workers run in another global context that is different from the current window. Thus, using the window shortcut to get the current global scope (instead of self) within a Worker will return an error.