想學以及正在學的東西

Must learn

• forwardRef

• VSCode debugger

• DOM 的事件傳遞機制：捕獲與冒泡

• onClick this and e

Want to learn

• Set a conditional breakpoint (Debug)
  https://developer.mozilla.org/en-US/docs/Tools/Debugger/How_to/Set_a_conditional_breakpoint

Learned

• getBoundingClientRect