The scale method specifies if the tree should be rendered using the tree's branch lengths or not (true by default). Branch lengths are computed taking the branch_length property of the tree object. This is normally set automatically when your input is a newick formatted tree that includes branch lengths. If scale is set to false, branch lengths are ignored and the tree will display in an isometric layout (all paths from leaves to root having the same length).
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://emepyc.github.io/tnt/v0/tnt.min.js to a secure url
https://d3js.org/d3.v3.min.js
https://emepyc.github.io/tnt/v0/tnt.min.js