Text-overflow effects inline content when it overflows it's block container. Overflow can only occur if the block container has an overflow value of something other then visible and when white-space is set to no-wrap.
ellipsis: Renders an ellipsis character (U+2026) or three dots "..." to represent clipped inline content.
clip: Clips inline content that overflows, any extra characters will not be visible. Characters may be only partially rendered.