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<html>
<head>
<meta charset="utf-8">
<title>Reference case for text-decoration with subelements</title>
<style>
div.wrapper {
font-size: 2em;
position: relative;
}
sup.baseline {
vertical-align: baseline;
}
.hide {
color: transparent;
}
div {
white-space: nowrap;
}
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<p>Test passes if there is a single uniform underline for all the text in each line,
<i>not</i> a separate underline for the superscripts:
</p>
<div class=wrapper>
<div style="position: absolute; top: 1em;">
<!-- We use position:absolute and overflow:hidden so that this element will be
shrink-wrapped to fit the width of its content, and clip the underline of
the descendant span to the width of this text. -->
<div style="position: absolute; overflow: hidden;">Einstein said that <i>e = mc<sup>2</sup></i>.
<div style="position: absolute; top: 0;">
<!-- Generate a single continuous underline with the appropriate style
by underlining a span of transparent text; it will be too wide for the
actual test text, as we're not matching its mixture of font styles,
but then will be clipped to the shrink-wrap width of the abs-pos
containing block. -->
<span style="text-decoration: underline;">
<span class=hide>Einstein said that e = mc2......</span></span>
<span class=hide><sup>2</sup></span><!-- to ensure baseline is consistent with testcase -->
</div>
</div>
</div>
<div style="position: absolute; top: 3em;">
<div style="position: absolute; overflow: hidden;">Is <i>a<sup>n</sup> + b<sup>n</sup> = c<sup>n</sup></i> ever true for <i>n</i> > 2.
<div style="position: absolute; top: 0;">
<span style="text-decoration: underline;">
<span class=hide>Is an + bn = cn ever true for n > 2......</span></span>
<span class=hide><sup>n</sup></span><!-- to ensure baseline is consistent with testcase -->
</div>
</div>
</div>
</div>
</body>
</html>
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