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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Test case for text-decoration-thickness</title>
    <meta name="assert" content="text-decoration-thickness: the width of the decoration line is increased">
    <link rel="author" title="Charlie Marlow" href="mailto:cmarlow@mozilla.com">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#text-decoration-width-property">
    <link rel="match" href="reference/text-decoration-thickness-vertical-green-rect-ref.html">
    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
    <style>
        #box{
            font: 20px/1 Ahem;
            background-color: red;
            height: 4em;
            width: 1em;
            overflow: hidden;
        }
        /*
         * The underline is placed to the left of the text
         * at the right edge of the #box scrollpart. It is
         * 1.3 em away so that the entire text-decoration covers
         * the vertical box. Its text-decoration should grow "out"
         * away from the text, covering up the scrollport. We
         * will use 1.5 em-wide decoration line to be sure the
         * scrollport is still fully covered if there are small
         * differences in the placement of the line.
         */
        #text{
            color: transparent;
            writing-mode: vertical-rl;
            position: relative;
            left: 1.3em;
            text-decoration: green underline;
            text-decoration-skip-ink: none;
            text-decoration-thickness: 1.5em;
        }
    </style>
</head>
<body>
    <p>Test fails if there is any red visible</p>
    <div id="box"><div id="text">XXXX</div></div>
</body>
</html>