Using CSS for a fade-in effect on page load

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Can CSS transitions be used to allow a text paragraph to fade-in on page load?

I really like how it looked on http://dotmailapp.com/ and would love to use a similar effect using CSS. The domain has since been purchased and no longer has the effect mentioned. An archived copy can be viewed on the Wayback Machine.

Illustration

Having this markup:

<div id="test">
    <p>​This is a test</p>
</div>​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

With the following CSS rule:

#test p {
    opacity: 0;
    margin-top: 25px;
    font-size: 21px;
    text-align: center;
    -webkit-transition: opacity 2s ease-in;
    -moz-transition: opacity 2s ease-in;
    -o-transition: opacity 2s ease-in;
    -ms-transition: opacity 2s ease-in;
    transition: opacity 2s ease-in;
}​

How can the transition be triggered on load?

4 s
4

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