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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: First available font defines the 'ex' unit size</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#length-units" />
        <link rel="help" href="https://www.w3.org/TR/css-values-3/#font-relative-lengths" />
        <link rel="match" href="numbers-units-019-ref.xht"/>
        <meta name="flags" content="ahem" />
        <meta name="assert" content="The 'ex' unit size is defined by the element's first available font." />
        <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
        <style type="text/css">
            body
            {
                font-size: 40px;
            }
            p
            {
                font-size: 12pt;
            }
            div
            {
                background: black;
                font-family: invalidFont, Ahem;
                margin-top: 3px;
            }
            #test
            {
                height: 1ex;
                width: 1ex;
            }
            #compare
            {
                height: 0.8em;
                width: 0.8em;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the two boxes below are the same size.</p>
        <div id="test"></div>
        <div id="compare"></div>
    </body>
</html>