fix: fallback ie (#440)

* fix: fallback ie

* chore: comment it

Author: zombieJ

src/Dom/shadow.ts

@@ -1,7 +1,17 @@
+function getRoot(ele: Node) {
+  return ele?.getRootNode?.();
+}
+
+/**
+ * Check if is in shadowRoot
+ */
 export function inShadow(ele: Node) {
-  return ele?.getRootNode() !== ele?.ownerDocument;
+  return getRoot(ele) !== ele?.ownerDocument;
 }
 
+/**
+ * Return shadowRoot if possible
+ */
 export function getShadowRoot(ele: Node): ShadowRoot {
-  return inShadow(ele) ? (ele?.getRootNode() as ShadowRoot) : null;
+  return inShadow(ele) ? (getRoot(ele) as ShadowRoot) : null;
 }