In reality many fonts that include these characters ignore the Unicode definition, and instead design the digits for mathematical numerator and denominator glyphs, which are aligned with the cap line and the baseline, respectively. Thus "H₂O" (using a subscript 2 character) is supposed to be identical to "H 2O" (with subscript markup). The intended use when these characters were added to Unicode was to produce true superscripts and subscripts so that chemical and algebraic formulas could be written without markup. However, when super and sub-scripts are to reflect semantic distinctions, it is easier to work with these meanings encoded in text rather than markup, for example, in phonetic or phonemic transcription. When used in mathematical context ( MathML) it is recommended to consistently use style markup for superscripts and subscripts. The World Wide Web Consortium and the Unicode Consortium have made recommendations on the choice between using markup and using superscript and subscript characters: 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. Unicode has subscripted and superscripted versions of a number of characters including a full set of Arabic numerals. In many popular fonts the Unicode "superscript" and "subscript" characters are actually numerator and denominator glyphs. The difference between superscript/subscript and numerator/denominator glyphs. Without proper rendering support, you may see question marks, boxes, or other symbols. This article contains special characters.
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