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