diff --git a/ios/chrome/browser/ui/dialogs/BUILD.gn b/ios/chrome/browser/ui/dialogs/BUILD.gn
index f99224478565..4f054c6cc013 100644
--- a/ios/chrome/browser/ui/dialogs/BUILD.gn
+++ b/ios/chrome/browser/ui/dialogs/BUILD.gn
@@ -110,6 +110,7 @@ source_set("eg_tests") {
     "//base",
     "//base/test:test_support",
     "//components/strings",
+    "//components/url_formatter",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/ui",
     "//ios/chrome/test/app:test_support",
diff --git a/ios/chrome/browser/ui/dialogs/dialog_presenter.mm b/ios/chrome/browser/ui/dialogs/dialog_presenter.mm
index 4b3d5bccfaaa..a60d95b561eb 100644
--- a/ios/chrome/browser/ui/dialogs/dialog_presenter.mm
+++ b/ios/chrome/browser/ui/dialogs/dialog_presenter.mm
@@ -9,8 +9,8 @@
 #include "base/containers/circular_deque.h"
 #import "base/ios/block_types.h"
 #include "base/logging.h"
-#include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
+#include "components/url_formatter/elide_url.h"
 #import "ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.h"
 #import "ios/chrome/browser/ui/alert_coordinator/alert_coordinator.h"
 #import "ios/chrome/browser/ui/alert_coordinator/input_alert_coordinator.h"
@@ -376,19 +376,14 @@ - (void)tryToPresent {
 + (NSString*)localizedTitleForJavaScriptAlertFromPage:(const GURL&)pageURL
                                          mainFrameURL:
                                              (const GURL&)mainFrameURL {
-  NSString* localizedTitle = nil;
-  NSString* hostname = base::SysUTF8ToNSString(pageURL.host());
-
   bool sameOriginAsMainFrame = pageURL.GetOrigin() == mainFrameURL.GetOrigin();
-
   if (!sameOriginAsMainFrame) {
-    localizedTitle = l10n_util::GetNSString(
+    return l10n_util::GetNSString(
         IDS_JAVASCRIPT_MESSAGEBOX_TITLE_NONSTANDARD_URL_IFRAME);
-  } else {
-    localizedTitle = l10n_util::GetNSStringF(
-        IDS_JAVASCRIPT_MESSAGEBOX_TITLE, base::SysNSStringToUTF16(hostname));
   }
-  return localizedTitle;
+  base::string16 title = url_formatter::FormatUrlForSecurityDisplay(
+      pageURL, url_formatter::SchemeDisplay::OMIT_HTTP_AND_HTTPS);
+  return l10n_util::GetNSStringF(IDS_JAVASCRIPT_MESSAGEBOX_TITLE, title);
 }
 
 #pragma mark - Private methods.
diff --git a/ios/chrome/browser/ui/dialogs/dialog_presenter_unittest.mm b/ios/chrome/browser/ui/dialogs/dialog_presenter_unittest.mm
index 5fda24714a0a..51906f8a77ee 100644
--- a/ios/chrome/browser/ui/dialogs/dialog_presenter_unittest.mm
+++ b/ios/chrome/browser/ui/dialogs/dialog_presenter_unittest.mm
@@ -5,6 +5,7 @@
 #import "ios/chrome/browser/ui/dialogs/dialog_presenter.h"
 
 #include "base/strings/sys_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/ui/alert_coordinator/alert_coordinator.h"
@@ -138,6 +139,23 @@ - (void)dialogPresenter:(DialogPresenter*)presenter
   EXPECT_NSEQ(expected_title, different_origin_title);
 }
 
+// Tests that JavaScript dialogs have correct title when they are presented from
+// about:blank page.
+TEST_F(DialogPresenterTest, AboutBlankTest) {
+  DialogPresenterTestWebState web_state;
+  web_state.SetCurrentURL(GURL(url::kAboutBlankURL));
+  [presenter() runJavaScriptAlertPanelWithMessage:@""
+                                       requestURL:GURL(url::kAboutBlankURL)
+                                         webState:&web_state
+                                completionHandler:nil];
+
+  NSString* expected_title = l10n_util::GetNSStringF(
+      IDS_JAVASCRIPT_MESSAGEBOX_TITLE, base::UTF8ToUTF16(url::kAboutBlankURL));
+  NSString* actual_title =
+      [presenter() presentedDialogCoordinator].alertController.title;
+  EXPECT_NSEQ(expected_title, actual_title);
+}
+
 // Tests that multiple JavaScript dialogs are queued
 TEST_F(DialogPresenterTest, QueueTest) {
   // Tests that the dialog for |webState1| has been shown.
diff --git a/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm b/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
index 345409b289b1..4f0b046fe350 100644
--- a/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
+++ b/ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm
@@ -11,6 +11,7 @@
 #include "base/strings/utf_string_conversions.h"
 #import "base/test/ios/wait_util.h"
 #include "components/strings/grit/components_strings.h"
+#include "components/url_formatter/elide_url.h"
 #import "ios/chrome/browser/ui/dialogs/dialog_presenter.h"
 #include "ios/chrome/browser/ui/util/ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
@@ -232,10 +233,10 @@ void WaitForAlertToBeShown(NSString* alert_label) {
 
 // Waits for a JavaScript dialog to be shown from the page at |url|.
 void WaitForJavaScriptDialogToBeShown(const GURL& url) {
-  NSString* hostname = base::SysUTF8ToNSString(url.host());
-  NSString* expectedTitle = l10n_util::GetNSStringF(
-      IDS_JAVASCRIPT_MESSAGEBOX_TITLE, base::SysNSStringToUTF16(hostname));
-
+  base::string16 URLString = url_formatter::FormatUrlForSecurityDisplay(
+      url, url_formatter::SchemeDisplay::OMIT_HTTP_AND_HTTPS);
+  NSString* expectedTitle =
+      l10n_util::GetNSStringF(IDS_JAVASCRIPT_MESSAGEBOX_TITLE, URLString);
   WaitForAlertToBeShown(expectedTitle);
 }
 
@@ -258,9 +259,10 @@ void ShowJavaScriptDialog(JavaScriptAlertType type, const GURL& url) {
 void AssertJavaScriptAlertNotPresent(const GURL& url) {
   ConditionBlock condition = ^{
     NSError* error = nil;
-    NSString* hostname = base::SysUTF8ToNSString(url.host());
-    NSString* expectedTitle = l10n_util::GetNSStringF(
-        IDS_JAVASCRIPT_MESSAGEBOX_TITLE, base::SysNSStringToUTF16(hostname));
+    base::string16 URLString = url_formatter::FormatUrlForSecurityDisplay(
+        url, url_formatter::SchemeDisplay::OMIT_HTTP_AND_HTTPS);
+    NSString* expectedTitle =
+        l10n_util::GetNSStringF(IDS_JAVASCRIPT_MESSAGEBOX_TITLE, URLString);
 
     id<GREYMatcher> titleLabel =
         chrome_test_util::StaticTextWithAccessibilityLabel(expectedTitle);
@@ -607,11 +609,7 @@ - (void)testShowJavaScriptAfterNewTabAnimation {
   }
 
   // Wait for the alert to be shown.
-  NSString* hostname = base::SysUTF8ToNSString(self.onLoadPageURL.host());
-  NSString* expectedTitle = l10n_util::GetNSStringF(
-      IDS_JAVASCRIPT_MESSAGEBOX_TITLE, base::SysNSStringToUTF16(hostname));
-
-  WaitForAlertToBeShown(expectedTitle);
+  WaitForJavaScriptDialogToBeShown(self.onLoadPageURL);
 
   // Verify that the omnibox shows the correct URL when the dialog is visible.
   std::string title =