refactor: use overflow-y to determine scroll container
By using `overflow-y` instead of `overflow` using `endsWith` can be avoided and represents the data we are actually interested in here more accurately.
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@ -2,12 +2,8 @@ type ScrollBehavior = 'auto' | 'smooth' | 'instant';
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export function getScrollContainer(el: HTMLElement | null): HTMLElement | null {
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if (el == null || el.tagName === 'HTML') return null;
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const overflow = window.getComputedStyle(el).getPropertyValue('overflow');
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if (
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// xとyを個別に指定している場合、`hidden scroll`みたいな値になる
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overflow.endsWith('scroll') ||
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overflow.endsWith('auto')
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) {
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const overflow = window.getComputedStyle(el).getPropertyValue('overflow-y');
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if (overflow === 'scroll' || overflow === 'auto') {
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return el;
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} else {
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return getScrollContainer(el.parentElement);
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