[MathML] CSS试验性属性math-depth决定字号的缩小

hbghlyj

例如
<mroot>
    <mn>2</mn>
    <mn>3</mn>
</mroot>
在$\root3\of2$中, 2的math-depth是0, 而3的math-depth是2
检查computed styles(Browser Styles打勾)发现mroot > :not(:first-child)的math-depth是add(2)

所以根式的开方次数是深度增加2的, 所以字号很小
如果开方次数是<mfrac>
<mroot>
    <mn>2</mn>
    <mfrac><mn>3</mn><mn>1</mn></mfrac>
</mroot>
在$\root\frac13\of2$中, 3的math-depth是3
检查computed styles(Browser Styles打勾)发现

可以在style editor打开这个mathml.css

地址是resource://gre-resources/mathml.css 在新标签页打开却是空白的.
resource开头是浏览器内置的, 见Resource URLs
这里说Resource URL映射到C:\Program Files\Mozilla Firefox\res\...但是(Firefox 108版)没有找到该文件夹
math-depth对应于旧版的mathml.css中的-moz-script-level

1. /*****************************************/
2. /* Controlling scriptlevel               */
3. /*****************************************/
5. /* mfrac, munder, mover and munderover change the scriptlevels of their children using
6.    -moz-math-increment-script-level because regular CSS rules are insufficient to
7.    control when the scriptlevel should be incremented */
8. :-moz-math-increment-script-level { -moz-script-level:+1; }
10. /* all other cases can be described using regular CSS, so we do it this way because it's
11.    more efficient and less code */
12. mroot > :not(:first-child) { -moz-script-level:+2; }
14. msub > :not(:first-child),
15. msup > :not(:first-child),
16. msubsup > :not(:first-child),
17. mmultiscripts > :not(:first-child) { -moz-script-level:+1; }

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