I've found a way (by a lot of trial and error!) to get a video to resize responsively in Safari (iOS16.3.1 and Mac OS Monterey 12.6.3) Here's the HTML: <video controls="true"; width="100%"; playsinline="true"; src="xxx.mp4"; type="video/mp4"> (The video tag is inside p tags but that doesn't render in this forum) and here's the CSS: video { height: auto; width: 100%; } Also it still works in Chrome.