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diff --git a/web/core/modules/system/tests/src/FunctionalJavascript/OffCanvasTest.php b/web/core/modules/system/tests/src/FunctionalJavascript/OffCanvasTest.php
new file mode 100644
index 000000000..567919c3e
--- /dev/null
+++ b/web/core/modules/system/tests/src/FunctionalJavascript/OffCanvasTest.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Drupal\Tests\system\FunctionalJavascript;
+
+/**
+ * Tests the off-canvas dialog functionality.
+ *
+ * @group settings_tray
+ */
+class OffCanvasTest extends OffCanvasTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'off_canvas_test',
+  ];
+
+  /**
+   * Tests that non-contextual links will work with the off-canvas dialog.
+   */
+  public function testOffCanvasLinks() {
+    // Test the same functionality on multiple themes.
+    foreach ($this->getTestThemes() as $theme) {
+      $this->enableTheme($theme);
+      $this->drupalGet('/off-canvas-test-links');
+
+      $page = $this->getSession()->getPage();
+      $web_assert = $this->assertSession();
+
+      // Make sure off-canvas dialog is on page when first loaded.
+      $web_assert->elementNotExists('css', '#drupal-off-canvas');
+
+      // Check opening and closing with two separate links.
+      // Make sure tray updates to new content.
+      // Check the first link again to make sure the empty title class is
+      // removed.
+      foreach (['1', '2', '1'] as $link_index) {
+        // Click the first test like that should open the page.
+        $page->clickLink("Click Me $link_index!");
+        $this->waitForOffCanvasToOpen();
+
+        // Check that the canvas is not on the page.
+        $web_assert->elementExists('css', '#drupal-off-canvas');
+        // Check that response text is on page.
+        $web_assert->pageTextContains("Thing $link_index says hello");
+        $off_canvas_tray = $this->getOffCanvasDialog();
+
+        // Check that tray is visible.
+        $this->assertEquals(TRUE, $off_canvas_tray->isVisible());
+        $header_text = $off_canvas_tray->find('css', '.ui-dialog-title')->getText();
+
+        $tray_text = $off_canvas_tray->findById('drupal-off-canvas')->getText();
+        $this->assertEquals("Thing $link_index says hello", $tray_text);
+
+        if ($link_index == '2') {
+          // Check no title behavior.
+          $web_assert->elementExists('css', '.ui-dialog-empty-title');
+          $this->assertEquals("\xc2\xa0", $header_text);
+
+          $style = $page->find('css', '.ui-dialog-off-canvas')->getAttribute('style');
+          $this->assertTrue(strstr($style, 'width: 555px;') !== FALSE, 'Dialog width respected.');
+          $page->clickLink("Click Me 1!");
+          $this->waitForOffCanvasToOpen();
+          $style = $page->find('css', '.ui-dialog-off-canvas')->getAttribute('style');
+          $this->assertTrue(strstr($style, 'width: 555px;') === FALSE, 'Dialog width reset to default.');
+        }
+        else {
+          // Check that header is correct.
+          $this->assertEquals("Thing $link_index", $header_text);
+          $web_assert->elementNotExists('css', '.ui-dialog-empty-title');
+        }
+      }
+    }
+  }
+
+  /**
+   * Tests the body displacement behaves differently at a narrow width.
+   */
+  public function testNarrowWidth() {
+    $narrow_width_breakpoint = 768;
+    $offset = 20;
+    $height = 800;
+    $page = $this->getSession()->getPage();
+    $web_assert = $this->assertSession();
+
+    // Test the same functionality on multiple themes.
+    foreach ($this->getTestThemes() as $theme) {
+      $this->enableTheme($theme);
+      // Testing at the wider width.
+      $this->getSession()->resizeWindow($narrow_width_breakpoint + $offset, $height);
+      $this->drupalGet('/off-canvas-test-links');
+      $this->assertFalse($page->find('css', '.dialog-off-canvas-main-canvas')->hasAttribute('style'), 'Body not padded on wide page load.');
+      $page->clickLink("Click Me 1!");
+      $this->waitForOffCanvasToOpen();
+      // Check that the main canvas is padded when page is not narrow width and
+      // tray is open.
+      $web_assert->elementAttributeContains('css', '.dialog-off-canvas-main-canvas', 'style', 'padding-right');
+
+      // Testing at the narrower width.
+      $this->getSession()->resizeWindow($narrow_width_breakpoint - $offset, $height);
+      $this->drupalGet('/off-canvas-test-links');
+      $this->assertFalse($page->find('css', '.dialog-off-canvas-main-canvas')->hasAttribute('style'), 'Body not padded on narrow page load.');
+      $page->clickLink("Click Me 1!");
+      $this->waitForOffCanvasToOpen();
+      $this->assertFalse($page->find('css', '.dialog-off-canvas-main-canvas')->hasAttribute('style'), 'Body not padded on narrow page with tray open.');
+    }
+  }
+
+}