diff --git a/core/emitter.js b/core/emitter.js
index 0f9ba4f06a..76fd97e5ea 100644
--- a/core/emitter.js
+++ b/core/emitter.js
@@ -4,14 +4,12 @@ import logger from './logger';
 
 const debug = logger('quill:events');
 const EVENTS = ['selectionchange', 'mousedown', 'mouseup', 'click'];
+const EMITTERS = [];
 
 EVENTS.forEach(eventName => {
   document.addEventListener(eventName, (...args) => {
-    Array.from(document.querySelectorAll('.ql-container')).forEach(node => {
-      const quill = instances.get(node);
-      if (quill && quill.emitter) {
-        quill.emitter.handleDOM(...args);
-      }
+    EMITTERS.forEach(emitter => {
+      emitter.handleDOM(...args);
     });
   });
 });
@@ -20,6 +18,7 @@ class Emitter extends EventEmitter {
   constructor() {
     super();
     this.listeners = {};
+    EMITTERS.push(this);
     this.on('error', debug.error);
   }
 
@@ -29,8 +28,24 @@ class Emitter extends EventEmitter {
   }
 
   handleDOM(event, ...args) {
+    const target = (event.composedPath ? event.composedPath()[0] : event.target);
+    const containsNode = (node, target) => {
+      if (!('getRootNode' in document) || target.getRootNode() === document) {
+        return node.contains(target);
+      }
+
+      while (!node.contains(target)) {
+        const root = target.getRootNode();
+        if (!root || !root.host) {
+          return false;
+        }
+        target = root.host;
+      }
+
+      return true;
+    };
     (this.listeners[event.type] || []).forEach(({ node, handler }) => {
-      if (event.target === node || node.contains(event.target)) {
+      if (target === node || containsNode(node, target)) {
         handler(event, ...args);
       }
     });
diff --git a/core/selection.js b/core/selection.js
index b181b088f8..3761ebaa75 100644
--- a/core/selection.js
+++ b/core/selection.js
@@ -20,13 +20,14 @@ class Selection {
     this.composing = false;
     this.mouseDown = false;
     this.root = this.scroll.domNode;
+    this.rootDocument = (this.root.getRootNode ? this.root.getRootNode() : document);
     this.cursor = this.scroll.create('cursor', this);
     // savedRange is last non-null range
     this.savedRange = new Range(0, 0);
     this.lastRange = this.savedRange;
     this.handleComposition();
     this.handleDragging();
-    this.emitter.listenDOM('selectionchange', document, () => {
+    this.emitter.listenDOM('selectionchange', this.rootDocument, () => {
       if (!this.mouseDown && !this.composing) {
         setTimeout(this.update.bind(this, Emitter.sources.USER), 1);
       }
@@ -175,7 +176,7 @@ class Selection {
   }
 
   getNativeRange() {
-    const selection = document.getSelection();
+    const selection = this.rootDocument.getSelection();
     if (selection == null || selection.rangeCount <= 0) return null;
     const nativeRange = selection.getRangeAt(0);
     if (nativeRange == null) return null;
@@ -193,8 +194,8 @@ class Selection {
 
   hasFocus() {
     return (
-      document.activeElement === this.root ||
-      contains(this.root, document.activeElement)
+      this.rootDocument.activeElement === this.root ||
+      contains(this.root, this.rootDocument.activeElement)
     );
   }
 
@@ -316,7 +317,7 @@ class Selection {
     ) {
       return;
     }
-    const selection = document.getSelection();
+    const selection = this.rootDocument.getSelection();
     if (selection == null) return;
     if (startNode != null) {
       if (!this.hasFocus()) this.root.focus();
diff --git a/modules/toolbar.js b/modules/toolbar.js
index a16923ec0a..d73a15c7c1 100644
--- a/modules/toolbar.js
+++ b/modules/toolbar.js
@@ -15,7 +15,8 @@ class Toolbar extends Module {
       quill.container.parentNode.insertBefore(container, quill.container);
       this.container = container;
     } else if (typeof this.options.container === 'string') {
-      this.container = document.querySelector(this.options.container);
+      const rootDocument = ('getRootNode' in document ? quill.container.getRootNode() : document);
+      this.container = rootDocument.querySelector(this.options.container);
     } else {
       this.container = this.options.container;
     }