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I was visiting a site and it had a small pop-up window that said welcome and then it went away after a few seconds. I tried looking at the page source but could not find out how he did that as I would like to put that on my site to notify everone when I am on vacation. How can this be done? <br />
With example code please, thanks.
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I was visiting a site and it had a small pop-up window that said welcome and then it went away after a few seconds. I tried looking at the page source but could not find out how he did that as I would like to put that on my site to notify everone when I am on vacation. How can this be done? 
With example code please, thanks.

popup window

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.