JavaScript comment starting with /*!

Question

My editor (Geany) changes the colour of a comment when a comment starts with /*!. What\'s the difference between /* ... */ and /*! ... */

Answer 1

In Javascript, there is none, they're both just inline comments. Presumably geany is doing special coloring for some documentation tool or similar (edit: apparently it's YUI Compressor, see x1a4's answer) that treats /*! comments specially (similar to the way JSDoc treats /** comments specially).