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    <p>Honestly I don't see the point in doing superscript/subscript in CSS only. There's no handy CSS attribute for it, just a bunch of homegrown implementations including:</p> <pre><code>.superscript { position: relative; top: -0.5em; font-size: 80%; } </code></pre> <p>or using vertical-align or I'm sure other ways. Thing is, it starts to get complicated:</p> <ul> <li><a href="http://www.xs4all.nl/~sbpoley/webmatters/superscripts.html" rel="noreferrer">CSS superscript spacing</a> on line height;</li> <li><a href="http://www.personal.psu.edu/ejp10/blogs/tlt/2007/02/beware_css_for_superscriptsubc.html" rel="noreferrer">Beware CSS for Superscript/Subcript</a> on why you arguably shouldn't style superscript/subscript with CSS <strong>at all</strong>;</li> </ul> <p>The second point is worth emphasizing. Typically superscript/subscript is not actually a styling issue but is indicative of meaning.</p> <p><strong>Side note:</strong> It's worth mentioning this <a href="http://symbolcodes.tlt.psu.edu/bylanguage/mathchart.html#super" rel="noreferrer">list of entities for common mathematical superscript and subscript expressions</a> even though this question doesn't relate to that.</p> <p>The sub/sup tags are in HTML and XHTML. I would just use those.</p> <p>As for the rest of your CSS, the :after pseudo-element and content attributes are not widely supported. If you really don't want to put this manually in the HTML I think a Javascript-based solution is your next best bet. With jQuery this is as simple as:</p> <pre><code>$(function() { $("a.external").append("&lt;sup&gt;+&lt;/sup&gt;"); }; </code></pre>
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    1. POSuperscript in CSS only?
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    1. USMike Dimmick
    1. UScletus
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    1. COWith "not widely supported" you mean "not supported in IE", I suppose?
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      1. USBoldewyn
    2. COhttp://www.quirksmode.org/css/contents.html not supported in IE7 and lower or in IE8 in compatibility mode.
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    3. CO...which is quite exactly what I said, yes.
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