This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
The NodeIterator.pointerBeforeReferenceNode read-only property returns a boolean flag that indicates whether the NodeFilter is anchored before (if this value is true) or after (if this value is false) the anchor node indicated by the NodeIterator.referenceNode property.
A boolean.
const nodeIterator = document.createNodeIterator(
document.body,
NodeFilter.SHOW_ELEMENT,
{
acceptNode(node) {
return NodeFilter.FILTER_ACCEPT;
},
},
);
flag = nodeIterator.pointerBeforeReferenceNode;
| Specification |
|---|
| DOM> # dom-nodeiterator-pointerbeforereferencenode> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
pointerBeforeReferenceNode |
1 | 17 | 3.5 | ≤15 | 3 | 18 | 4 | ≤14 | 3 | 1.0 | 4.4 | 3 |
NodeIterator
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https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator/pointerBeforeReferenceNode