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 startContainer property of the AbstractRange interface returns the start Node for the range.
The Node inside which the start position of the range is found.
let startNode = range.startContainer;
| Specification |
|---|
| DOM> # ref-for-dom-range-startcontainer①> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
startContainer |
90 | 9018–79 | 69 | 76 | 14.1 | 90 | 79 | 64 | 14.5 | 15.0 | 90 | 14.5 |
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https://developer.mozilla.org/en-US/docs/Web/API/AbstractRange/startContainer