Internal Styles

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CSS enclosed in <style></style> tags within an HTML document functions like an external stylesheet, except that it lives in the HTML document it styles instead of in a separate file, and therefore can only be applied to the document in which it lives. Note that this element must be inside the <head> element for HTML validation (though it will work in all current browsers if placed in body).

        h1 {
            color: green;
            text-decoration: underline;
        p {
            font-size: 25px;
            font-family: 'Trebuchet MS', sans-serif;
    <h1>Hello world!</h1>
    <p>I ♥ CSS</p>

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