No images or additional elements are used to create these speech bubbles. You only require a single <p> tag and a little CSS3 code.
For more information, please please refer to:
Pure CSS3 Speech Bubbles Without Images
This example code was developed by Craig Buckler of OptimalWorks.net for SitePoint.com.
It can be used without any restrictions but please don't expect 24/7 support! A link back to SitePoint.com is appreciated.