[MathJax] chtml output 竖线 缩放后消失

hbghlyj

github.com/mathjax/MathJax/issues/2741(Vertical double bar not rendered in Firefox on Linux)
github.com/mathjax/MathJax/issues/2732(Straight lines of \vmatrix{} doesn't show up on Firefox)
github.com/mathjax/MathJax/issues/2844(\left\Vert \frac{}{} \right\Vert doesn't work in firefox)

test code:
$$\left|f^{(2 p+1)}(x)\right| \mathrm{d}x$$
$$\left|f^{(2 p+1)}(x)\right| \mathrm{d}x$$
MathJax demo:
mathjax.org/#demo
Chrome 录屏:


换成svg output则没有此问题(所以本论坛不会出现此问题)