MathJax code is working in the math and physics stack exchange but not working in GitHub. Why? - mathjax

Question

The following code is working perfectly fine in the math and physics stack exchange but not working in Github even though it is using the same MathJax. What is the problem here?
$$\boxed{ \begin{aligned} \mathcal{L}=&-\frac{1}{4} B_{\mu \nu} B^{\mu \nu}-\frac{1}{8} t r\left(\mathbf{W}_{\mu \nu} \mathbf{W}^{\mu \nu}\right)-\frac{1}{2} t r\left(\mathbf{G}_{\mu \nu} \mathbf{G}^{\mu \nu}\right) &{\text{(U(1), SU(2) and SU(3) gauge terms)}}\\ &+\left(\bar{\nu}_{L}, \bar{e}_{L}\right) \tilde{\sigma}^{\mu} i D_{\mu}\left(\begin{array}{c} \nu_{L} \\ e_{L} \end{array}\right)+\bar{e}_{R} \sigma^{\mu} i D_{\mu} e_{R}+\bar{\nu}_{R} \sigma^{\mu} i D_{\mu} \nu_{R}+(\text { h.c. }) &{\text{(lepton dynamical term)}}\\ &-\frac{\sqrt{2}}{v}\left[\left(\bar{\nu}_{L}, \bar{e}_{L}\right) \phi M^{e} e_{R}+\bar{e}_{R} \bar{M}^{e} \bar{\phi}\left(\begin{array}{c} \nu_{L} \\ e_{L} \end{array}\right)\right] &{\text{(electron, muon, tauon mass term)}}\\ &-\frac{\sqrt{2}}{v}\left[\left(-\bar{e}_{L}, \bar{\nu}_{L}\right) \phi^{*} M^{\nu} \nu_{R}+\bar{\nu}_{R} \bar{M}^{\nu} \phi^{T}\left(\begin{array}{c} - e_{L} \\ \nu_{L} \end{array}\right)\right] &{\text{(neutrino mass term)}}\\ &+\left(\bar{u}_{L}, \bar{d}_{L}\right) \tilde{\sigma}^{\mu} i D_{\mu}\left(\begin{array}{c} u_{L} \\ d_{L} \end{array}\right)+\bar{u}_{R} \sigma^{\mu} i D_{\mu} u_{R}+\bar{d}_{R} \sigma^{\mu} i D_{\mu} d_{R}+(\text { h.c. })&{\text{(quark dynamical term)}} \\ &-\frac{\sqrt{2}}{v}\left[\left(\bar{u}_{L}, \bar{d}_{L}\right) \phi M^{d} d_{R}+\bar{d}_{R} \bar{M}^{d} \bar{\phi}\left(\begin{array}{c} u_{L} \\ d_{L} \end{array}\right)\right] &\text{(down, strange, bottom mass term)}\\ &-\frac{\sqrt{2}}{v}\left[\left(-\bar{d}_{L}, \bar{u}_{L}\right) \phi^{*} M^{u} u_{R}+\bar{u}_{R} \bar{M}^{u} \phi^{T}\left(\begin{array}{c} -d_{L} \\ u_{L} \end{array}\right)\right] &{\text{(up, charmed, top mass term)}}\\ &+\overline{\left(D_{\mu} \phi\right)} D^{\mu} \phi-m_{h}^{2}\left[\bar{\phi} \phi-v^{2} / 2\right]^{2} / 2 v^{2} &\text{(Higgs dynamical and mass term)} \end{aligned} }$$