--- /dev/null
+<?php
+
+namespace Drupal\Tests\node\FunctionalJavascript;
+
+use Drupal\filter\Entity\FilterFormat;
+use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
+
+/**
+ * Tests the JavaScript prevention of navigation away from node previews.
+ *
+ * @group node
+ */
+class NodePreviewLinkTest extends WebDriverTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['node', 'filter'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setUp() {
+ parent::setUp();
+
+ $filtered_html_format = FilterFormat::create([
+ 'format' => 'filtered_html',
+ 'name' => 'Filtered HTML',
+ ]);
+ $filtered_html_format->save();
+
+ $this->drupalCreateContentType(['type' => 'test']);
+
+ $user = $this->drupalCreateUser([
+ 'access content',
+ 'edit own test content',
+ 'create test content',
+ $filtered_html_format->getPermissionName(),
+ ]);
+ $this->drupalLogin($user);
+ }
+
+ /**
+ * Test the behavior of clicking preview links.
+ */
+ public function testPreviewLinks() {
+ $assertSession = $this->assertSession();
+ $this->drupalPostForm('node/add/test', [
+ 'title[0][value]' => 'Test node',
+ 'body[0][value]' => '<a href="#foo">Anchor link</a><a href="/foo">Normal link</a>',
+ ], t('Preview'));
+ $this->clickLink('Anchor link');
+ $assertSession->pageTextNotContains('Leave preview?');
+ $this->clickLink('Normal link');
+ $assertSession->pageTextContains('Leave preview?');
+ $this->click('button:contains("Leave preview")');
+ $this->assertStringEndsWith('/foo', $this->getUrl());
+ }
+
+}