svg example moveable http://www.petercollingridge.co.uk/tutorials/svg/interactive/dragging/ https://github.com/petercollingridge/code-for-blog/tree/master/svg-interaction/draggable
create delete edit svg http://www.petercollingridge.co.uk/tutorials/svg/interactive/javascript/
trace bitmap simple (de studiat) https://github.com/rshest/bitmap-outline
svg to canvas to png http://bl.ocks.org/biovisualize/8187844
manipulate html,svg,css https://d3js.org/d3.v5.min.js
https://octoperf.com/blog/2018/04/17/d3-js-mouse-events-and-transitions-tutorial/