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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The Selection.extend() method moves the focus of the selection to a specified point. The anchor of the selection does not move. The selection will be from the anchor to the new focus regardless of direction.


sel.extend(node, offset)


The node within which the focus will be moved.
offset Optional
The offset position within node where the focus will be moved to. If not specified, the default value 0 is used.


Specification Status Comment
HTML Editing APIs
The definition of 'Selection.extend()' in that specification.
Editor's Draft Initial definition
Selection API
The definition of 'Selection.extend()' in that specification.
Working Draft Current

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes) (Yes) (Yes) No support (Yes) (Yes)
offset parameter is optional (Yes) ? 55 (55) No support (Yes) (Yes)
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? (Yes) (Yes) ? ? (Yes)
offset parameter is optional ? ? 55.0 (55) ? ? (Yes)

See also



 最終更新者: chrisdavidmills,