diff --git a/shells/browser/shared/src/main.js b/shells/browser/shared/src/main.js
index d09dddf1bd..63859497b1 100644
--- a/shells/browser/shared/src/main.js
+++ b/shells/browser/shared/src/main.js
@@ -30,12 +30,13 @@ function createPanelIfReactLoaded() {
 
       clearInterval(loadCheckInterval);
 
-      let renderRootToPortal = null;
       let bridge = null;
       let store = null;
-      let elementsPanel = null;
-      let profilerPanel = null;
-      let settingsPanel = null;
+      let elementsPortalContainer = null;
+      let profilerPortalContainer = null;
+      let settingsPortalContainer = null;
+      let cloneStyleTags = null;
+      let render = null;
 
       function initBridgeAndStore() {
         let hasPortBeenDisconnected = false;
@@ -68,51 +69,47 @@ function createPanelIfReactLoaded() {
         const container = document.createElement('div');
         const root = createRoot(container);
 
-        renderRootToPortal = ({ overrideTab, portalContainer }) => {
+        render = overrideTab => {
           root.render(
             createElement(DevTools, {
               bridge,
               browserName: getBrowserName(),
               browserTheme: getBrowserTheme(),
+              elementsPortalContainer,
               overrideTab,
-              portalContainer,
+              profilerPortalContainer,
+              settingsPortalContainer,
               showTabBar: false,
               store,
               viewElementSource,
             })
           );
-
-          const oldLinkTags = document.getElementsByTagName('link');
-          const newLinkTags = [];
-          for (let oldLinkTag of oldLinkTags) {
-            if (oldLinkTag.rel === 'stylesheet') {
-              const newLinkTag = document.createElement('link');
-              for (let attribute of oldLinkTag.attributes) {
-                newLinkTag.setAttribute(
-                  attribute.nodeName,
-                  attribute.nodeValue
-                );
-              }
-              newLinkTags.push(newLinkTag);
-            }
-          }
-
-          return newLinkTags;
         };
-
-        if (elementsPanel !== null) {
-          elementsPanel.render(renderRootToPortal, 'elements');
-        }
       }
 
+      cloneStyleTags = () => {
+        const linkTags = [];
+        for (let linkTag of document.getElementsByTagName('link')) {
+          if (linkTag.rel === 'stylesheet') {
+            const newLinkTag = document.createElement('link');
+            for (let attribute of linkTag.attributes) {
+              newLinkTag.setAttribute(attribute.nodeName, attribute.nodeValue);
+            }
+            linkTags.push(newLinkTag);
+          }
+        }
+        return linkTags;
+      };
+
       initBridgeAndStore();
 
       chrome.devtools.panels.create('⚛ Elements', '', 'panel.html', panel => {
         panel.onShown.addListener(panel => {
-          elementsPanel = panel;
-
-          if (renderRootToPortal !== null) {
-            elementsPanel.render(renderRootToPortal, 'elements');
+          elementsPortalContainer = panel.container;
+          if (elementsPortalContainer != null) {
+            elementsPortalContainer.innerHTML = '';
+            render('elements');
+            panel.injectStyles(cloneStyleTags);
           }
 
           // TODO: When the user switches to the panel, check for an Elements tab selection.
@@ -125,20 +122,22 @@ function createPanelIfReactLoaded() {
       // TODO (profiling) Is there a way to detect profiling support and conditionally register this panel?
       chrome.devtools.panels.create('⚛ Profiler', '', 'panel.html', panel => {
         panel.onShown.addListener(panel => {
-          profilerPanel = panel;
-
-          if (renderRootToPortal !== null) {
-            profilerPanel.render(renderRootToPortal, 'profiler');
+          profilerPortalContainer = panel.container;
+          if (profilerPortalContainer != null) {
+            profilerPortalContainer.innerHTML = '';
+            render('profiler');
+            panel.injectStyles(cloneStyleTags);
           }
         });
       });
 
       chrome.devtools.panels.create('⚛ Settings', '', 'panel.html', panel => {
         panel.onShown.addListener(panel => {
-          settingsPanel = panel;
-
-          if (renderRootToPortal !== null) {
-            settingsPanel.render(renderRootToPortal, 'settings');
+          settingsPortalContainer = panel.container;
+          if (settingsPortalContainer != null) {
+            settingsPortalContainer.innerHTML = '';
+            render('settings');
+            panel.injectStyles(cloneStyleTags);
           }
         });
       });
diff --git a/shells/browser/shared/src/panel.js b/shells/browser/shared/src/panel.js
index b7413918f5..1ce574dfcf 100644
--- a/shells/browser/shared/src/panel.js
+++ b/shells/browser/shared/src/panel.js
@@ -1,18 +1,13 @@
-const container = document.getElementById('container');
+window.container = document.getElementById('container');
 
 let hasInjectedStyles = false;
 
-window.render = (renderRootToPortal, tab) => {
-  container.innerHTML = '';
-
-  const linkTags = renderRootToPortal({
-    overrideTab: tab,
-    portalContainer: container,
-  });
-
+window.injectStyles = getLinkTags => {
   if (!hasInjectedStyles) {
     hasInjectedStyles = true;
 
+    const linkTags = getLinkTags();
+
     for (let linkTag of linkTags) {
       document.head.appendChild(linkTag);
     }
diff --git a/src/devtools/views/DevTools.js b/src/devtools/views/DevTools.js
index 2db0e2dcfb..d80a0ecbe1 100644
--- a/src/devtools/views/DevTools.js
+++ b/src/devtools/views/DevTools.js
@@ -1,7 +1,6 @@
 // @flow
 
 import React, { useEffect, useState } from 'react';
-import { createPortal } from 'react-dom';
 import Store from '../store';
 import { BridgeContext, StoreContext } from './context';
 import Elements from './Elements/Elements';
@@ -26,10 +25,12 @@ export type TabID = 'elements' | 'profiler' | 'settings';
 export type Props = {|
   bridge: Bridge,
   browserName: BrowserName,
-  defaultTab?: TabID,
   browserTheme: BrowserTheme,
+  defaultTab?: TabID,
+  elementsPortalContainer?: Element,
   overrideTab?: TabID,
-  portalContainer?: Element,
+  profilerPortalContainer?: Element,
+  settingsPortalContainer?: Element,
   showTabBar?: boolean,
   store: Store,
   viewElementSource?: ?Function,
@@ -60,10 +61,12 @@ const tabsWithoutProfiler = [elementTab, settingsTab];
 export default function DevTools({
   bridge,
   browserName,
-  defaultTab = 'elements',
   browserTheme = 'light',
+  defaultTab = 'elements',
+  elementsPortalContainer,
   overrideTab,
-  portalContainer,
+  profilerPortalContainer,
+  settingsPortalContainer,
   showTabBar = false,
   store,
   viewElementSource = null,
@@ -98,21 +101,26 @@ export default function DevTools({
   let tabElement;
   switch (tab) {
     case 'profiler':
-      tabElement = <Profiler />;
+      tabElement = <Profiler portalContainer={profilerPortalContainer} />;
       break;
     case 'settings':
-      tabElement = <Settings />;
+      tabElement = <Settings portalContainer={settingsPortalContainer} />;
       break;
     case 'elements':
     default:
-      tabElement = <Elements />;
+      tabElement = <Elements portalContainer={elementsPortalContainer} />;
       break;
   }
 
-  const children = (
+  return (
     <BridgeContext.Provider value={bridge}>
       <StoreContext.Provider value={store}>
-        <SettingsContextController browserTheme={browserTheme}>
+        <SettingsContextController
+          browserTheme={browserTheme}
+          elementsPortalContainer={elementsPortalContainer}
+          profilerPortalContainer={profilerPortalContainer}
+          settingsPortalContainer={settingsPortalContainer}
+        >
           <TreeContextController viewElementSource={viewElementSource}>
             <ProfilerContextController>
               <div className={styles.DevTools}>
@@ -144,8 +152,4 @@ export default function DevTools({
       </StoreContext.Provider>
     </BridgeContext.Provider>
   );
-
-  return portalContainer != null
-    ? createPortal(children, portalContainer)
-    : children;
 }
diff --git a/src/devtools/views/Elements/Elements.js b/src/devtools/views/Elements/Elements.js
index cb401ddfdb..596a5c754a 100644
--- a/src/devtools/views/Elements/Elements.js
+++ b/src/devtools/views/Elements/Elements.js
@@ -1,15 +1,18 @@
 // @flow
 
 import React from 'react';
+import { createPortal } from 'react-dom';
 import Tree from './Tree';
 import SelectedElement from './SelectedElement';
 import styles from './Elements.css';
 
-export type Props = {||};
+export type Props = {|
+  portalContainer?: Element,
+|};
 
-export default function Elements(_: Props) {
+export default function Elements({ portalContainer }: Props) {
   // TODO Flex wrappers below should be user resizable.
-  return (
+  const children = (
     <div className={styles.Elements}>
       <div className={styles.TreeWrapper}>
         <Tree />
@@ -19,4 +22,8 @@ export default function Elements(_: Props) {
       </div>
     </div>
   );
+
+  return portalContainer != null
+    ? createPortal(children, portalContainer)
+    : children;
 }
diff --git a/src/devtools/views/Profiler/Profiler.js b/src/devtools/views/Profiler/Profiler.js
index add7926922..e5c2db601a 100644
--- a/src/devtools/views/Profiler/Profiler.js
+++ b/src/devtools/views/Profiler/Profiler.js
@@ -1,6 +1,7 @@
 // @flow
 
 import React, { Suspense, useCallback, useContext, useState } from 'react';
+import { createPortal } from 'react-dom';
 import { ProfilerContext } from './ProfilerContext';
 import Button from '../Button';
 import ButtonIcon from '../ButtonIcon';
@@ -13,21 +14,30 @@ import SnapshotSelector from './SnapshotSelector';
 
 import styles from './Profiler.css';
 
-export default function Profiler(_: {||}) {
+export type Props = {|
+  portalContainer?: Element,
+|};
+
+export default function Profiler({ portalContainer }: Props) {
   const { hasProfilingData, isProfiling, rootHasProfilingData } = useContext(
     ProfilerContext
   );
 
+  let children = null;
   if (isProfiling || !rootHasProfilingData) {
-    return (
+    children = (
       <NonSuspendingProfiler
         hasProfilingData={hasProfilingData}
         isProfiling={isProfiling}
       />
     );
   } else {
-    return <SuspendingProfiler />;
+    children = <SuspendingProfiler />;
   }
+
+  return portalContainer != null
+    ? createPortal(children, portalContainer)
+    : children;
 }
 
 // This view is rendered when there is no profiler data (either we haven't profiled yet or we're currently profiling).
diff --git a/src/devtools/views/Settings/Settings.js b/src/devtools/views/Settings/Settings.js
index 37e4dd9198..d3a99360a0 100644
--- a/src/devtools/views/Settings/Settings.js
+++ b/src/devtools/views/Settings/Settings.js
@@ -1,13 +1,16 @@
 // @flow
 
 import React, { useCallback, useContext } from 'react';
+import { createPortal } from 'react-dom';
 import { SettingsContext } from './SettingsContext';
 
 import styles from './Settings.css';
 
-export type Props = {||};
+export type Props = {|
+  portalContainer?: Element,
+|};
 
-export default function Settings(_: Props) {
+export default function Settings({ portalContainer }: Props) {
   const { displayDensity, setDisplayDensity, theme, setTheme } = useContext(
     SettingsContext
   );
@@ -26,7 +29,7 @@ export default function Settings(_: Props) {
     [setTheme]
   );
 
-  return (
+  const children = (
     <div className={styles.Settings}>
       <div className={styles.Section}>
         <div className={styles.Header}>Theme</div>
@@ -90,4 +93,8 @@ export default function Settings(_: Props) {
       </div>
     </div>
   );
+
+  return portalContainer != null
+    ? createPortal(children, portalContainer)
+    : children;
 }
diff --git a/src/devtools/views/Settings/SettingsContext.js b/src/devtools/views/Settings/SettingsContext.js
index 0c5458cbad..f04af61f32 100644
--- a/src/devtools/views/Settings/SettingsContext.js
+++ b/src/devtools/views/Settings/SettingsContext.js
@@ -23,18 +23,58 @@ type Context = {|
 const SettingsContext = createContext<Context>(((null: any): Context));
 SettingsContext.displayName = 'SettingsContext';
 
+type DocumentElements = Array<HTMLElement>;
+
 type Props = {|
   browserTheme: BrowserTheme,
   children: React$Node,
+  elementsPortalContainer?: Element,
+  profilerPortalContainer?: Element,
+  settingsPortalContainer?: Element,
 |};
 
-function SettingsContextController({ browserTheme, children }: Props) {
+function SettingsContextController({
+  browserTheme,
+  children,
+  elementsPortalContainer,
+  profilerPortalContainer,
+  settingsPortalContainer,
+}: Props) {
   const [displayDensity, setDisplayDensity] = useLocalStorage<DisplayDensity>(
     'displayDensity',
     'compact'
   );
   const [theme, setTheme] = useLocalStorage<Theme>('theme', 'auto');
 
+  const documentElements = useMemo<DocumentElements>(() => {
+    const array: Array<HTMLElement> = [
+      ((document.documentElement: any): HTMLElement),
+    ];
+    if (elementsPortalContainer != null) {
+      array.push(
+        ((elementsPortalContainer.ownerDocument
+          .documentElement: any): HTMLElement)
+      );
+    }
+    if (profilerPortalContainer != null) {
+      array.push(
+        ((profilerPortalContainer.ownerDocument
+          .documentElement: any): HTMLElement)
+      );
+    }
+    if (settingsPortalContainer != null) {
+      array.push(
+        ((settingsPortalContainer.ownerDocument
+          .documentElement: any): HTMLElement)
+      );
+    }
+    return array;
+  }, [
+    elementsPortalContainer,
+    profilerPortalContainer,
+    settingsPortalContainer,
+  ]);
+
   const comfortableLineHeight = parseInt(
     getComputedStyle((document.body: any)).getPropertyValue(
       '--comfortable-line-height-data'
@@ -51,31 +91,31 @@ function SettingsContextController({ browserTheme, children }: Props) {
   useLayoutEffect(() => {
     switch (displayDensity) {
       case 'compact':
-        updateDisplayDensity('compact');
+        updateDisplayDensity('compact', documentElements);
         break;
       case 'comfortable':
-        updateDisplayDensity('comfortable');
+        updateDisplayDensity('comfortable', documentElements);
         break;
       default:
         throw Error(`Unsupported displayDensity value "${displayDensity}"`);
     }
-  }, [displayDensity]);
+  }, [displayDensity, documentElements]);
 
   useLayoutEffect(() => {
     switch (theme) {
       case 'light':
-        updateThemeVariables('light');
+        updateThemeVariables('light', documentElements);
         break;
       case 'dark':
-        updateThemeVariables('dark');
+        updateThemeVariables('dark', documentElements);
         break;
       case 'auto':
-        updateThemeVariables(browserTheme);
+        updateThemeVariables(browserTheme, documentElements);
         break;
       default:
         throw Error(`Unsupported theme value "${theme}"`);
     }
-  }, [browserTheme, theme]);
+  }, [browserTheme, theme, documentElements]);
 
   const value = useMemo(
     () => ({
@@ -105,63 +145,95 @@ function SettingsContextController({ browserTheme, children }: Props) {
   );
 }
 
-function setStyleVariable(name: string, value: string) {
-  (document.documentElement: any).style.setProperty(name, value);
+function setStyleVariable(
+  name: string,
+  value: string,
+  documentElements: DocumentElements
+) {
+  documentElements.forEach(documentElement =>
+    documentElement.style.setProperty(name, value)
+  );
 }
 
-function updateStyleHelper(themeKey: string, style: string) {
-  setStyleVariable(`--${style}`, `var(--${themeKey}-${style})`);
+function updateStyleHelper(
+  themeKey: string,
+  style: string,
+  documentElements: DocumentElements
+) {
+  setStyleVariable(
+    `--${style}`,
+    `var(--${themeKey}-${style})`,
+    documentElements
+  );
 }
 
-function updateDisplayDensity(displayDensity: DisplayDensity): void {
-  updateStyleHelper(displayDensity, 'font-size-monospace-normal');
-  updateStyleHelper(displayDensity, 'font-size-monospace-large');
-  updateStyleHelper(displayDensity, 'font-size-sans-normal');
-  updateStyleHelper(displayDensity, 'font-size-sans-large');
-  updateStyleHelper(displayDensity, 'line-height-data');
+function updateDisplayDensity(
+  displayDensity: DisplayDensity,
+  documentElements: DocumentElements
+): void {
+  updateStyleHelper(
+    displayDensity,
+    'font-size-monospace-normal',
+    documentElements
+  );
+  updateStyleHelper(
+    displayDensity,
+    'font-size-monospace-large',
+    documentElements
+  );
+  updateStyleHelper(displayDensity, 'font-size-sans-normal', documentElements);
+  updateStyleHelper(displayDensity, 'font-size-sans-large', documentElements);
+  updateStyleHelper(displayDensity, 'line-height-data', documentElements);
 }
 
-function updateThemeVariables(theme: Theme): void {
-  updateStyleHelper(theme, 'color-attribute-name');
-  updateStyleHelper(theme, 'color-attribute-value');
-  updateStyleHelper(theme, 'color-attribute-editable-value');
-  updateStyleHelper(theme, 'color-background');
-  updateStyleHelper(theme, 'color-border');
-  updateStyleHelper(theme, 'color-button-background');
-  updateStyleHelper(theme, 'color-button-background-focus');
-  updateStyleHelper(theme, 'color-button-background-hover');
-  updateStyleHelper(theme, 'color-button');
-  updateStyleHelper(theme, 'color-button-disabled');
-  updateStyleHelper(theme, 'color-button-focus');
-  updateStyleHelper(theme, 'color-button-hover');
-  updateStyleHelper(theme, 'color-commit-did-not-render');
-  updateStyleHelper(theme, 'color-commit-gradient-0');
-  updateStyleHelper(theme, 'color-commit-gradient-1');
-  updateStyleHelper(theme, 'color-commit-gradient-2');
-  updateStyleHelper(theme, 'color-commit-gradient-3');
-  updateStyleHelper(theme, 'color-commit-gradient-4');
-  updateStyleHelper(theme, 'color-commit-gradient-5');
-  updateStyleHelper(theme, 'color-commit-gradient-6');
-  updateStyleHelper(theme, 'color-commit-gradient-7');
-  updateStyleHelper(theme, 'color-commit-gradient-8');
-  updateStyleHelper(theme, 'color-commit-gradient-9');
-  updateStyleHelper(theme, 'color-commit-gradient-text');
-  updateStyleHelper(theme, 'color-component-name');
-  updateStyleHelper(theme, 'color-component-name-inverted');
-  updateStyleHelper(theme, 'color-dim');
-  updateStyleHelper(theme, 'color-dimmer');
-  updateStyleHelper(theme, 'color-dimmest');
-  updateStyleHelper(theme, 'color-jsx-arrow-brackets');
-  updateStyleHelper(theme, 'color-jsx-arrow-brackets-inverted');
-  updateStyleHelper(theme, 'color-modal-background');
-  updateStyleHelper(theme, 'color-record-active');
-  updateStyleHelper(theme, 'color-record-hover');
-  updateStyleHelper(theme, 'color-record-inactive');
-  updateStyleHelper(theme, 'color-tree-node-selected');
-  updateStyleHelper(theme, 'color-tree-node-hover');
-  updateStyleHelper(theme, 'color-search-match');
-  updateStyleHelper(theme, 'color-search-match-current');
-  updateStyleHelper(theme, 'color-text-color');
+function updateThemeVariables(
+  theme: Theme,
+  documentElements: DocumentElements
+): void {
+  updateStyleHelper(theme, 'color-attribute-name', documentElements);
+  updateStyleHelper(theme, 'color-attribute-value', documentElements);
+  updateStyleHelper(theme, 'color-attribute-editable-value', documentElements);
+  updateStyleHelper(theme, 'color-background', documentElements);
+  updateStyleHelper(theme, 'color-border', documentElements);
+  updateStyleHelper(theme, 'color-button-background', documentElements);
+  updateStyleHelper(theme, 'color-button-background-focus', documentElements);
+  updateStyleHelper(theme, 'color-button-background-hover', documentElements);
+  updateStyleHelper(theme, 'color-button', documentElements);
+  updateStyleHelper(theme, 'color-button-disabled', documentElements);
+  updateStyleHelper(theme, 'color-button-focus', documentElements);
+  updateStyleHelper(theme, 'color-button-hover', documentElements);
+  updateStyleHelper(theme, 'color-commit-did-not-render', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-0', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-1', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-2', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-3', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-4', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-5', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-6', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-7', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-8', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-9', documentElements);
+  updateStyleHelper(theme, 'color-commit-gradient-text', documentElements);
+  updateStyleHelper(theme, 'color-component-name', documentElements);
+  updateStyleHelper(theme, 'color-component-name-inverted', documentElements);
+  updateStyleHelper(theme, 'color-dim', documentElements);
+  updateStyleHelper(theme, 'color-dimmer', documentElements);
+  updateStyleHelper(theme, 'color-dimmest', documentElements);
+  updateStyleHelper(theme, 'color-jsx-arrow-brackets', documentElements);
+  updateStyleHelper(
+    theme,
+    'color-jsx-arrow-brackets-inverted',
+    documentElements
+  );
+  updateStyleHelper(theme, 'color-modal-background', documentElements);
+  updateStyleHelper(theme, 'color-record-active', documentElements);
+  updateStyleHelper(theme, 'color-record-hover', documentElements);
+  updateStyleHelper(theme, 'color-record-inactive', documentElements);
+  updateStyleHelper(theme, 'color-tree-node-selected', documentElements);
+  updateStyleHelper(theme, 'color-tree-node-hover', documentElements);
+  updateStyleHelper(theme, 'color-search-match', documentElements);
+  updateStyleHelper(theme, 'color-search-match-current', documentElements);
+  updateStyleHelper(theme, 'color-text-color', documentElements);
 }
 
 export { SettingsContext, SettingsContextController };