I'm trying to build config UI for my custom nodes, but I can't seem to find the document section regarding all the possible "fa-xxx" tags for the label class. I just keep seeing magic tags in 3rd-party nodes, such as the "fa-ellipsis" in this one
<label for="node-input-property"><i class="fa fa-ellipsis-h"></i> <span data-i18n="node-red:common.label.property"></span></label>
Where should I look to find all the available label classes?