diff --git a/packages/netlify-cms-core/src/components/Editor/EditorPreviewPane/EditorPreviewPane.js b/packages/netlify-cms-core/src/components/Editor/EditorPreviewPane/EditorPreviewPane.js
index 51c72385..a7218a99 100644
--- a/packages/netlify-cms-core/src/components/Editor/EditorPreviewPane/EditorPreviewPane.js
+++ b/packages/netlify-cms-core/src/components/Editor/EditorPreviewPane/EditorPreviewPane.js
@@ -211,7 +211,7 @@ export class PreviewPane extends React.Component {
     });
 
     if (!collection) {
-      <PreviewPaneFrame head={styleEls} />;
+      <PreviewPaneFrame id="preview-pane" head={styleEls} />;
     }
 
     const initialContent = `
@@ -224,7 +224,7 @@ export class PreviewPane extends React.Component {
 
     return (
       <ErrorBoundary config={config}>
-        <PreviewPaneFrame head={styleEls} initialContent={initialContent}>
+        <PreviewPaneFrame id="preview-pane" head={styleEls} initialContent={initialContent}>
           <EditorPreviewContent {...{ previewComponent, previewProps }} />
         </PreviewPaneFrame>
       </ErrorBoundary>