videoタグの使い方 例 <video src=”https://video.twimg.com/ext_tw_video/1661477032365260801/pu/vid/1280×720/yvRC2bYOWFbSmKtU.mp4″ poster=’https://pbs.twimg.com/ext_tw_video_thumb/1661477032365260801/pu/img/I_7-f5FincZg-g1I.jpg’ preload=”none” controls></video> src 動画のURL poster サムネイル画像のURL preload none: ページ読…