问题
If I wanted to embed 20 videos on a page will they all start buffering on page load or will they wait until they are played/interacted with for the first time? If they buffer on load how could I circumvent this until I want to display the video? I don't want a user to be buffering 20 videos when they may only be watching one or even none at all.
回答1:
You are looking at the preload attribute of HTML5 video tag. Here is the doc. Basically there are three options :
auto - when browser should load the entire video when the page loads
metadata - when browser should load only metadata when the page loads
none - when browser should NOT load the video when the page loads
来源：https://stackoverflow.com/questions/21790012/do-html-5-videos-buffer-on-page-load-or-only-when-playing-the-video