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<! DOCTYPE html>

Gourmet Thai Cooking

The element is often used as a container for other HTML elements to style them with CSS or to perform certain tasks with JavaScript.
That element is

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<! DOCTYPE html The Daily Special
<! DOCTYPE html> Sulfuric Acid

H₂SO₄
<! DOCTYPE html>

CSS

this links to CSS
<! DOCTYPE html>

EM Dash

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<! DOCTYPE html> Inline Image