Send to your Kindle RIGHT:[[:t/参考に]] :IntersectionObserver's Coming into View - Web - Google Developers| [[https://developers.google.com/web/updates/2016/04/intersectionobserver?hl=ja]] :Intersection Observer API - Web API - MDN| [[https://developer.mozilla.org/ja/docs/Web/API/Intersection_Observer_API]] RIGHT:[[:t/参考に]] :IntersectionObserver's Coming into View - Web - Google Developers| [[https://developers.google.com/web/updates/2016/04/intersectionobserver?hl=ja]] :Intersection Observer API - Web API - MDN| [[https://developer.mozilla.org/ja/docs/Web/API/Intersection_Observer_API]]
