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In IntelliJ IDEA, you can see where and how symbols, such as tags, classes, fields, methods, or functions are defined in your project.
For this purpose, the IDE features the Quick Definition popup.
To view definition of a symbol, select it in the editor and press Ctrl+Shift+I (or click View | Quick Definition).
💡 Useful when you want to see the code of a function at glance without browsing the code.