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Many of these features are already implemented in at least one major browser (most of them in two or more), and what Modernizr does is, very simply, tell you whether the current browser has this feature natively implemented or not.
Modernizr is available under the MIT and BSD licenses.
CSS features
| Feature | Modernizr JS object property / CSS classname |
| @font-face | fontface |
| background-size | border-image |
| border-radius | borderradius |
| box-shadow | boxshadow |
| Flexible Box Model | flexbox |
HTML5 features
| Feature | Modernizr JS object property / CSS classname |
| applicationCache | applicationcache |
| Canvas | canvas |
| Canvas Text | canvastext |
| Drag and Drop | draganddrop |
| hashchange Event | hashchange |
| History Management | history |
| HTML5 Audio | audio |
| HTML5 Video | video |
Miscellaneous
| Feature | Modernizr JS object property / CSS classname |
| Geolocation API | geolocation |
| Inline SVG | inlinesvg |
| SMIL | smil |
| SVG | svg |
| SVG Clip paths | svgclippaths |
| Touch Events | touch |
| WebGL | webgl |