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                      mglyph

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                      mglyph was extended to support general image inclusion (sort of like a img element in HTML). In earlier versions of MathML, the idea was that mglyph was a way of including characters from a non-standard font. This was not used much and the old usage of specifying a font and index into that font is deprecated in MathML 3. mglyph now takes attributes to specify the source of the image, size, and alignment. For accessibility reasons, an alt attribute value is required. For complete details on mglyph, see Section 3.2.1.2 of the MathML 3 recommendation.

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