e.g.: https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/geometry/walk.html
https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/geometry/index.html
https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/geometry/CubicCurves.html
https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/geometry/spinning.html
https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/geometry/sphere.html
https://htmlpreview.github.io/?https://github.com/rockey-math/js/blob/main/3js/curves_param_3d.html