jsMath Mode of TeX4ht-cont

 \documentclass{article} \usepackage{amsmath}
 \begin{document}
   \[W(\Phi)= \begin{Vmatrix}
   \dfrac\varphi{(\varphi_1,\varepsilon_1)}&0&\dots&0\\
   \dfrac{\varphi k_{n2}}{(\varphi_2,\varepsilon_1)}&
   \dfrac\varphi{(\varphi_2,\varepsilon_2)}&\dots&0\\
   \hdotsfor{5}\\
   \dfrac{\varphi k_{n1}}{(\varphi_n,\varepsilon_1)}&
   \dfrac{\varphi k_{n2}}{(\varphi_n,\varepsilon_2)}&\dots&
   \dfrac{\varphi k_{n\,n-1}}{(\varphi_n,\varepsilon_{n-1})}&
   \dfrac{\varphi}{(\varphi_n,\varepsilon_n)}
   \end{Vmatrix}\]
 \end{document}
-_-_-
W(Φ) = \left \Vert \array{ { φ \over ({φ}_{1},{ɛ}_{1})} & 0 &\mathop{\mathop{…}}\kern 1.66702pt & 0 \cr { φ{k}_{n2} \over ({φ}_{2},{ɛ}_{1})} &{ φ \over ({φ}_{2},{ɛ}_{2})} &\mathop{\mathop{…}}\kern 1.66702pt & 0 \cr .&.&.&.&. \cr { φ{k}_{n1} \over ({φ}_{n},{ɛ}_{1})} &{ φ{k}_{n2} \over ({φ}_{n},{ɛ}_{2})} &\mathop{\mathop{…}}\kern 1.66702pt &{ φ{k}_{n\kern 1.66702pt n−1} \over ({φ}_{n},{ɛ}_{n−1})} &{ φ \over ({φ}_{n},{ɛ}_{n})} } \right \Vert
W(Φ) = \left \Vert \array{  
{    φ  
\over ({φ}_{1},{ε}_{1})}  
      &     0  
      &\mathop{\mathop{…}}\kern 1.66702pt  
      &     0  
\cr  
{  φ{k}_{n2}  
\over ({φ}_{2},{ε}_{1})}  
     &{     φ  
\over ({φ}_{2},{ε}_{2})}  
     &\mathop{\mathop{…}}\kern 1.66702pt  
     &     0  
\cr  
  .&.&.&.&.  
\cr  
{  φ{k}_{n1}  
\over ({φ}_{n},{ε}_{1})}  
     &{   φ{k}_{n2}  
\over ({φ}_{n},{ε}_{2})}  
     &\mathop{\mathop{…}}\kern 1.66702pt  
     &{   φ{k}_{n\kern 1.66702pt n−1}  
\over ({φ}_{n},{ε}_{n−1})}  
     &{      φ  
\over ({φ}_{n},{ε}_{n})}  }                                                      \right \Vert

Source from the testmath file of AMS [5].