我剛剛偶然發現 overflow:hidden 在 html 上的使用，這對我來說似乎不合邏輯：

* {
  all: unset;
  display: revert;
}
html {
  height: 100vh;
  overflow: hidden;
  background: black;
}
body {
  height: 50vh;
  font-size: 5rem;
  background: white;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  overflow-y: scroll;
}

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這是關於將滾動框從 html 移動到 body ，但我不明白為什麼這個例子只適用於 overflow:hidden？ body的高度已經只有50vh，那麼html元素上應該不會發生溢出吧？