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Continue to ChatQuery : What are hidden icons? What are hidden icons? I saw that term in Icons Handbook. The original emoticons only existed as 19×19px and, while they had transparent backgrounds, the edges https://vmapp.org/query/51240/What-Are-Hidden-Icons-What-Are-Hidden-Icons-I-Saw-That-Term-In-Icons-Handbook-The-Original-Emoticons-Only-Existed-As-19-19px-And-While-They-Had-Transparent-Backgrounds-The-Edges/