The Range.startContainer read-only property returns the Node within which the Range starts. To change the start position of a node, use one of the Range.setStart() methods. 
 The Range.startContainer read-only property returns the Node within which the Range starts. To change the start position of a node, use one of the Range.setStart() methods. 
A Node object.
js
range = document.createRange(); range.setStart(startNode, startOffset); range.setEnd(endNode, endOffset); startRangeNode = range.startContainer;
| Specification | 
|---|
| DOM Standard  # ref-for-dom-range-startcontainer①  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
startContainer | 
1 | 12 | 1 | 9 | 9 | 1 | 4.4 | 18 | 4 | 10.1 | 1 | 1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/Range/startContainer