[MathML] Unicode combining character

hbghlyj

在 MathML formatting with T_EX rules, T_EX fonts, and T_EX quality
说: 以下两段代码的效果应相同:
Hence, a MathML identifier like

1. <mi> a&#x0307; </mi>

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is typeset as $\dot a$ (the Unicode character U+0307 rep- resents the “combining dot above” ◦ ̇). A semantic accent usually denotes an operation, like first-order derivative in case of the “combining dot above”. As such it is marked up as

1. <mover accent="true">
2. <mi> a </mi>
3. <mo> &#x0307; </mo>
4. </mover>

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even though the formatted result is likely to be the same as in the previous case $\mathrm{ȧ}\dot{a}$
在Firefox中, 前者是直体, 后者是斜体: