TL;DR The HTML5 video tag looks simple but hides a surprising number of traps for beginners. Most developers ship broken or inaccessible video players because they skip three critical attributes. One of those attributes single-handedly fixes autoplay on every mobile browser — and most tutorials never mention it. The Problem: Your Video Works on Your Machine and Nowhere Else You dropped a <video> tag on your page. It played perfectly in Chrome on your laptop. You sent the link to your client. Silence. Then a screenshot of a broken video icon on their iPhone. Sound familiar? That moment of cold sweat is a rite of passage for almost every beginner working with the HTML5 video tag. The bad news: there are at least five different ways your video implementation can silently fail. The good news: every single one of them is completely preventable once you know what to look for. Let us fix that right now. Tip 1: Always Provide Multiple Source Formats Browsers are picky eaters. Chrome loves WebM.…