DocumentFragment.childElementCount
 The Document.childElementCount read-only property returns the number of child elements of a DocumentFragment. 
To get the number of children of a specific element, see Element.childElementCount.
Syntax
fragment.childElementCount;
Example
let fragment = new DocumentFragment() fragment.childElementCount; // 0 let paragraph = document.createElement('p') fragment.appendChild(paragraph) fragment.childElementCount; // 1
Specifications
| Specification | 
|---|
| DOM Standard (DOM) # dom-parentnode-childelementcount | 
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
| childElementCount | 29 | 17 | 25 | No | 16 | 9 | ≤37 | 29 | 25 | 16 | 9 | 2.0 | 
See also
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    https://developer.mozilla.org/en-US/docs/Web/API/DocumentFragment/childElementCount