AbstractRange: 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 April 2021.
The read-only startOffset property of the AbstractRange interface returns the offset into the start node of the range's start position.
To change the start position, use the Range.setStart() method or a similar one.
Value
An integer value indicating the number of characters into the Node indicated by startContainer at which the first character of the range is located.
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.
Example
const range = document.createRange();
range.setStart(startNode, startOffset);
range.setEnd(endNode, endOffset);
const startRangeOffset = range.startOffset;
Specifications
| Specification |
|---|
| DOM # ref-for-dom-range-startoffset① |