Initial commit

wwwroot/lib/popper.js/esm/dom-utils/contains.js

@@ -0,0 +1,23 @@
+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;
+}