23 lines
677 B
JavaScript
23 lines
677 B
JavaScript
import { isShadowRoot } from "./instanceOf.js";
|
|
export default function contains(parent, child) {
|
|
var rootNode = child.getRootNode && child.getRootNode(); // First, attempt with faster native method
|
|
|
|
if (parent.contains(child)) {
|
|
return true;
|
|
} // then fallback to custom implementation with Shadow DOM support
|
|
else if (rootNode && isShadowRoot(rootNode)) {
|
|
var next = child;
|
|
|
|
do {
|
|
if (next && parent.isSameNode(next)) {
|
|
return true;
|
|
} // $FlowFixMe[prop-missing]: need a better way to handle this...
|
|
|
|
|
|
next = next.parentNode || next.host;
|
|
} while (next);
|
|
} // Give up, the result is false
|
|
|
|
|
|
return false;
|
|
} |