diff --git a/QLExtension/Info.plist b/QLExtension/Info.plist
index e1464ec..58303ff 100644
--- a/QLExtension/Info.plist
+++ b/QLExtension/Info.plist
@@ -27,7 +27,7 @@
 		<key>NSExtensionAttributes</key>
 		<dict>
 			<key>QLIsDataBasedPreview</key>
-			<true/>
+			<false/>
 			<key>QLSupportedContentTypes</key>
 			<array>
 				<string>com.unknown.md</string>
diff --git a/QLExtension/PreviewViewController.swift b/QLExtension/PreviewViewController.swift
index 5f18bc0..39abd29 100644
--- a/QLExtension/PreviewViewController.swift
+++ b/QLExtension/PreviewViewController.swift
@@ -13,12 +13,11 @@ import external_launcher
 
 class MyWKWebView: WKWebView {
     override var canBecomeKeyView: Bool {
-        return false
+        return true
     }
 
     override func becomeFirstResponder() -> Bool {
-        // Quick Look window do not allow first responder child.
-        return false
+        return true
     }
 }
 
diff --git a/cmark-gfm b/cmark-gfm
index c168d57..587a12b 160000
--- a/cmark-gfm
+++ b/cmark-gfm
@@ -1 +1 @@
-Subproject commit c168d57acfa1f688e519e4e829f9a28d559bd5fa
+Subproject commit 587a12bb54d95ac37241377e6ddc93ea0e45439b