evnix

you can do it with a little help from javascript using the currentTime property. read more about it here http://www.w3schools.com/tags/av_prop_currenttime.asp

just run your HTML online! you can learn by using online tools such as http://jsfiddle.net/ (mainly for javascript) http://cssdeck.com/labs (for CSS) http://loadmycode.com/ (file based for html,css and js, plus allows uploading images and stuff) http://plnkr.co/edit/ (same as above but doesn't allow uploads) there are a few more, but loadmycode and plunkr are good for beginners as they segregate code into files and will give you a place to start testing. they also allow you to share your code, which means if your code doesn't work for some reason, you can put it on any one of those sites and let others know what exactly the problem is.