The read-only property ValidityState.badInput indicates if the user has provided input that the browser is unable to convert. For example, if you have a mail input element whose content does not have a '@'.
The Window.console read-only property returns a reference to the Console object, which provides methods for logging information to the browser's console. These methods are intended for debugging purposes only and should not be relied on for presenting information to end users.
The Window.devicePixelRatio read-only property returns the ratio of the (vertical) size of one physical pixel on the current display device to the size of one device independent pixels(dips).
The Window.screenX read-only property returns the horizontal distance, in CSS pixels, of the left border of the user's browser from the left side of the screen.
The Window.screenY read-only property returns the vertical distance, in CSS pixels of the top border of the user's browser from the top edge of the screen.
The Window.self read-only property returns the window itself, as a WindowProxy. It can be used with dot notation on a window object (that is, window.self) or standalone (self). The advantage of the standalone notation is that a similar notation exists for non-window contexts, such as in Web Workers. By using self, you can refer to the global scope in a way that will work not only in a window context (self will resolve to window.self) but also in a worker context (self will then resolve to WorkerGlobalScope.self).
The non-standard lastMatch property is a static and read-only property of regular expressions that contains the last matched characters. RegExp.$& is an alias for this property.
The non-standard lastParen property is a static and read-only property of regular expressions that contains the last parenthesized substring match, if any. RegExp.$+ is an alias for this property.
The non-standard leftContext property is a static and read-only property of regular expressions that contains the substring preceding the most recent match. RegExp.$` is an alias for this property.
The non-standard $1, $2, $3, $4, $5, $6, $7, $8, $9 properties are static and read-only properties of regular expressions that contain parenthesized substring matches.