Range: startOffset property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

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.

Value

A number.

Examples

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

Specifications

Specification
DOM Standard
# ref-for-dom-range-startoffset①

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
startOffset

Legend

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Full support
Full support

See also