Groups to options in native HTML for drop-down list. Really useful to differentiate between object groups in option tag. DEMO Greatest Metal Songs One Master of Puppets Fade to Black Peace Sells Symphony of Destruction Wake Up Dead Angel Of Death Raining Blood War Ensemble HTML < p > Greatest Metal Songs </ p > < select > < optgroup label = "Metallica" > < option > One </ option > < option > Master of Puppets </ option > < option > Fade to Black </ option > </ optgroup > < optgroup label = "Megadeth" > < option > Peace Sells </ option > < option > Symphony of Destruction </ option > < option > Wake Up Dead </ option > </ optgroup > < optgroup label = "Slayer" > < option > Angel Of Death </ option > <