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While working on jstree I came across this line of code-
<!-- one of the three classes will be applied depending on node structure -->
<li class="[ jstree-open | jstree-closed | jstree-leaf ]">
What does this mean?
This is not a verbatim example of what the resulting HTML will look like — it’s just pseudo-HTML to help developers understand what’s going to happen at runtime. There are no square brackets and no pipes in either the code or the resulting HTML. It’s just documentation.
It means that when the tree is rendered, one of the three classes will be applied on each element depending on its state and the structure of the tree.