Iroki reads Newick formatted trees. This is a widely used format for storing phylogenetic and other types of trees in plain text.
Here is an example of a tree with bootstrap support values. In this case, the support values run from 0 - 1, but depending on your tree building software, they might run from 0 - 100, or look super neat like this
95.6/100 if you used IQ-TREE.
Knowing which type of bootstrap support values your tree has will be important if you want to use the inner dots to represent bootstrap support.
((geode:1, (clock:0.5, tire:5.3)0.4:2)0.75:6, (banana:1.7, eggplant:1.5)0.5:3);
You can download this tree here.
This tree will look like this when viewed with Iroki.
For the rest of the examples, we will use this tree.