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/DOM

Range.collapse

The Range.collapse() method collapses the Range to one of its boundary points.

A collapsed Range is empty, containing no content, specifying a single-point in a DOM tree. To determine if a Range is already collapsed, see the Range.collapsed property.

Syntax

range.collapse(toStart);

Parameters

toStart Optional: A boolean value: true collapses the Range to its start, false to its end. If omitted, it defaults to false .

Example

var range = document.createRange();

referenceNode = document.getElementsByTagName("div").item(0);
range.selectNode(referenceNode);
range.collapse(true);

Specifications

Specification	Status	Comment
DOM The definition of 'Range.collapse()' in that specification.	Living Standard	The parameter is now optional and default to `false`.
Document Object Model (DOM) Level 2 Traversal and Range Specification The definition of 'Range.collapse()' in that specification.	Obsolete	Initial specification.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	Yes	4	9	9	Yes
`toStart` parameter optional	Yes	?	25	No No Optional but defaults to `true`.	15	Yes