How to find element by watir-webdriver using more than one class?

For example, we have element like this: <div class="first_class second_class"></div>

So we can find using it's classes:

• browser.div(class: 'first_class')
• browser.div(class: 'second_class')

But what is about multiple search? Can I use combination of them?

• browser.div(class: 'first_class second_class')?
• browser.div(class: 'second_class first_class')?

In this case, use a CSS selector directly:

browser.div(css: '.first_class.second_class')

Note that the "by class" locator is actually transformed to a "by CSS selector" under the hood.