$driver->wait()->until(
  WebDriverExpectedCondition::alertIsPresent(),
  'I am expecting an alert!'
);

// accepting the alert
$driver->switchTo()->alert()->accept();

// cancel/dismiss the alert
$driver->switchTo()->alert()->dismiss();

// get the text on the alert
$message = $driver->switchTo()->alert()->getText();

// send keys to the alert
$driver->switchTo()->alert()->sendKeys($name);

$current_handle = $driver->getWindowHandle();

// Get all window handles available to the current webdriver session.
// This will returns an array of string
$handles = $driver->getWindowHandles();

// Get current window handles first:
$windowHandlesBefore = $this->driver->getWindowHandles();
// Here do some event which opens new tab/window, like click to link etc.
// Then get list of the new window handles and find out which window is the new one.
// Do not use end($handles)! See note below.
$windowHandlesAfter = $this->driver->getWindowHandles();
$newWindowHandle = array_diff($windowHandlesAfter, $windowHandlesBefore);
// Now you know handle of the new window and can switch to it:
$driver->switchTo()->window(reset($newWindowHandle));

// Default behavior, without specifying window type
$driver->switchTo()->newWindow();
// Try to open new window
$driver->switchTo()->newWindow(WebDriverTargetLocator::WINDOW_TYPE_WINDOW);
// Try to open new tab
$driver->switchTo()->newWindow(WebDriverTargetLocator::WINDOW_TYPE_TAB);

// using the browser shortcut to create a new tab
$driver->getKeyboard()->sendKeys(
  array(WebDriverKeys::CONTROL, 't'),
);
// using the browser shortcut to create a new window
$driver->getKeyboard()->sendKeys(
  array(WebDriverKeys::CONTROL, 'n'),
);

$my_frame = $driver->findElement(WebDriverBy::id('my_frame'));
$driver->switchTo()->frame($myFrame);

$driver->switchTo()->frame(1);

$driver->switchTo()->defaultContent();

$active_element = $driver->switchTo()->activeElement();