Ternary Contour Plots in JavaScript

I would like to reopen #3503.

Currently there is no native support of ploting contours in ternary plot, the current official documentation for it is wrong (or inconsistent). As reported in this issue from the graphing-library-docs repo.

In plotly.py, Ternary contours in Python, there are ternary contour plots examples:

But in JS, Contour Plots in JavaScript, we only get:

Apparently, the JS example only fills the area instead of doing what is expected of a "contour" plot.

It would be great if this could be implemented (or if it already is, but only requires data transformation? ) and if there were examples showing how to plot the contours as in Ternary contours in Python.

リンクされている JavaScript ternary-contour と contour-plots のドキュメントから始め、次にリンクされている Python ternary-contour の例と比較します。Plotly.js が要求されたレンダリングをすでにサポートしているのか、それとも実装と例が必要なのかを判断します。完了とは、JavaScript で Python の例と同等の等高線を生成でき、公式ドキュメントが正しいことを意味します。