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The Range.startOffset read-only property returns a number representing where in the startContainer the Range starts.

If the startContainer is a Node of type Text, Comment, or CDATASection, then the offset is the number of characters from the start of the startContainer to the boundary point of the Range. For other Node types, the startOffset is the number of child nodes between the start of the startContainer and the boundary point of the Range.

To change the startOffset of a Range, use the Range.setStart method.

Syntax

startRangeOffset = range.startOffset;

Example

var range = document.createRange();
range.setStart(startNode,startOffset);
range.setEnd(endNode,endOffset);
var startRangeOffset = range.startOffset;

Specifications

Specification Status Comment
DOM
The definition of 'Range.startOffset' in that specification.
Living Standard No change.
Document Object Model (DOM) Level 2 Traversal and Range Specification
The definition of 'Range.startOffset' in that specification.
Obsolete Initial specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes499 Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes4 Yes Yes ?

See also

Document Tags and Contributors

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Last updated by: fscholz,