The Selection.isCollapsed read-only property returns a Boolean which indicates whether or not there is currently any text selected; That is to say that the selection's start and end points are at the same position in the content.

API DOM Experimental Expérimental HTML Editing Property Read-only Reference Référence Selection

The Selection.rangeCount read-only property returns the number of ranges in the selection.

API Experimental Expérimental HTML Editing Property Read-only Reference Référence Selection

The TimeRanges.length read-only property returns the number of ranges in the object.

API HTML DOM Media NeedsCompatTable Property Read-only Reference Référence TimeRanges

API Experimental Expérimental Property Read-only Reference Référence URL API URLUtilsReadOnly

API Experimental Expérimental Property Read-only Reference Référence URL API URLUtilsReadOnly

The Window.navigator read-only property returns a reference to the Navigator object, which can be queried for information about the application running the script.

API HTML DOM NeedsCompatTable NeedsExample NeedsMarkupWork NeedsSpecTable Property Read-only Reference Référence Window