Checks that the given element exists on the page and is visible.
You can also specify expected attributes of this element.
php
seeElement('.error');
$I->seeElement('//form/input[1]');
$I->seeElement('input', ['name' => 'login']);
$I->seeElement('input', ['value' => '123456']);
strict locator in first arg, attributes in second
$I->seeElement(['css' => 'form input'], ['name' => 'login']);
?>