how do i make youtube videos play automaticaly when the page is opened?
In the name of all decent Yolers I beg you please don't do it. It falls into top 5 of the most irritating things browsing, and the biggest factor to jack up page's bounce rate. What could be worse than once you open a page then some annoyingly slow-downloading video spoils otherwise maybe pleasant experience with website... Instant bounce-off for most folks.