moveto example

    $this->drupalGet('user');
    $this->assertSession()->assertWaitOnAjaxRequest();
    $current_page_string = 'NOT_RELOADED_IF_ON_PAGE';
    $this->getSession()->executeScript('document.body.appendChild(document.createTextNode("' . $current_page_string . '"));');

    // Move the pointer over the branding block so the contextual link appears     // as it would with a real user interaction. Otherwise clickContextualLink()     // does not open the dialog in a manner that is opener-aware, and it isn't     // possible to reliably test focus management.     $driver_session = $this->getSession()->getDriver()->getWebDriverSession();
    $element = $driver_session->element('css selector', '#block-branding');
    $driver_session->moveto(['element' => $element->getID()]);
    $this->clickContextualLink('#block-branding', 'Test Link with Ajax', FALSE);
    $this->assertNotEmpty($this->assertSession()->waitForElementVisible('css', '#drupal-modal'));
    $this->assertSession()->elementContains('css', '#drupal-modal', 'Everything is contextual!');
    $this->getSession()->executeScript('document.querySelector("#block-branding .trigger").addEventListener("focus", (e) => e.target.classList.add("i-am-focused"))');
    $this->getSession()->getPage()->pressButton('Close');
    $this->assertSession()->assertNoElementAfterWait('css', 'ui.dialog');

    // When the dialog is closed, the opening contextual link is now inside a     // collapsed container, so focus should be routed to the contextual link     // toggle button.     $this->assertNotNull($this->assertSession()->waitForElement('css', '.trigger.i-am-focused'), $this->getSession()->getPage()->find('css', '#block-branding')->getOuterHtml());
    

  /** * Moves mouse pointer to location of $selector. * * @param string $selector * CSS selector. */
  protected function movePointerTo($selector) {
    $driver_session = $this->getSession()->getDriver()->getWebDriverSession();
    $element = $driver_session->element('css selector', $selector);
    $driver_session->moveto(['element' => $element->getID()]);
  }

}