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The subscripts and superscripts are set in upright font, in keeping with normal practice for numerals and descriptive subscripts. To set the superscript or subscript in oblique font, as for a subscript that itself is a variable, use the HTML <var>...</var> or <i>...</i> tags, or the wikimarkup for italics ('').
This may be confusing in the common case where several methods are used in the same article. Moreover, mathematicians who are used to reading and writing texts written with LaTeX often find the raw HTML rendering awful. So, raw HTML should normally not be used for new content. However, raw HTML is still present in many mathematical articles.
The {} and {} templates are useful shortcuts to the HTML markup. Do not use the Unicode subscripts and superscripts ² and ³, or XML/HTML character entity references (² etc.). Rather, write <sup>2</sup> and <sup>3</sup> to produce the superscripts 2 and 3. The superscripted 2 and 3 are easier to read, especially on small displays, and ...
In HTML and Wiki syntax, subscript text is produced by putting it inside the tags <sub> and </sub>. Similarly, superscripts are produced with <sup> and </sup> . [ 7 ] The exact size and position of the resulting characters will vary by font and browser, but are usually reduced to around 75% original size.
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The formula's background and font size match the rest of HTML contents (this can be fixed on TeX formulas by using the commands \pagecolor and \definecolor) and the appearance respects CSS and browser settings while the typeface is conveniently altered to help you identify formulae.
An IP editor keeps adding an external link to a document by Piotr Grochowski requesting to add 1120 more superscripts, subscripts and small capitals to the Unicode Standard. I do not believe that it is appropriate to link to this document from this article because even a well-written character encoding proposal is not notable until and unless ...
These characters allow any polynomial, chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX. The World Wide Web Consortium and the Unicode Consortium have made recommendations on the choice between using markup and using superscript and subscript characters: