dy - SVG: Scalable Vector Graphics | MDN - Mozilla
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/dy
For <altGlyph>, if it contains a single value, dy defines a shift along the y-axis for all alternate glyph.. If there are multiple values, dy defines a shift along the y-axis for each individual glyph relative to the preceding glyph. If there are less values than glyphs, the remaining glyphs use a value of 0.If there are more values than glyphs, extra values are ignored.
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