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HTMLElement: offsetTop プロパティ - Web API | MDN
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HTMLElement: offsetTop プロパティ
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
HTMLElement.offsetTop は読み取り専用プロパティで、現在の要素の外枠（そのマージンを含む）から、最も近い位置指定祖先要素である offsetParent のパディング上辺までの距離を返します。
値
数値です。
例
js
const d = document.getElementById("div1");
const topPos = d.offsetTop;
if (topPos > 10) {
// 要素が offsetParent から 11px 以上離れている場合の処理をここに記述
}
仕様書
| Specification |
|---|
| CSSOM View Module # dom-htmlelement-offsettop |
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