How did I open the MathJax menu in Safari (on iPhone)

I was viewing a post on my iPhone (in Safari) which had some MathJax equations, and I accidentally clicked on an equation and opened its MathJax menu:

Anyone know how I did that?

I can’t seem to find a consistent method to repeat it (though I can get it to open sometimes with a random volley of frustrated taps).

Test Equation
$$\text{Menu}=C_a*T (t_n, t_d)$$

where $$\C_a\$$ is the coefficient of annoyance,
$$\T\$$ is the tap sequence as a function of the number of taps $$\t_n\$$, and the tap delay $$\t_d\$$.

• On PC, right-clicking the equation will open the MathJax menu. Perhaps the equivalent of long-pressing the equation on touch-screen devices? Feb 17, 2019 at 7:40
• @AndrewT. For me, that just ends up selecting some of the equation’s text. I tried doing so with various pressures as well. Feb 17, 2019 at 12:13