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並前往https://www.w3schools.com/Jsref/prop_element_offsettop.asp

HTML DOM offsetTop Property - W3Schools

The offsetTop property returns the top position (in pixels) relative to the top of the offsetParent element. The returned value includes:.

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查詢 「offsetTop」的人也找了：

  1. offsetParent
    2.
  2. Queryselector offsettop
    3.
  3. scrollTop
    4.
  4. scrollTop, offsetTop
    5.
  5. getBoundingClientRect
    6.
  6. pageYOffset
    7.
  7. offsetHeight
    8.
  8. clientHeight
    9.