- <hgroup>
- <select id="surface">
- <option id="random" _label="Random Surface"/>
- <option id="dini" _label="Dini's Surface" arg-set="-surface dini"/>
- <option id="enneper" _label="Enneper's Surface" arg-set="-surface enneper"/>
- <option id="kuen" _label="Kuen Surface" arg-set="-surface kuen"/>
- <option id="moebius" _label="Moebius Strip" arg-set="-surface moebius"/>
- <option id="seashell" _label="Seashell" arg-set="-surface seashell"/>
- <option id="swallow" _label="Swallowtail" arg-set="-surface swallowtail"/>
- <option id="bohemian" _label="Bohemian Dome" arg-set="-surface bohemian"/>
- <option id="whitney" _label="Whitney Umbrella" arg-set="-surface whitney"/>
- <option id="pluecker" _label="Pluecker's Conoid" arg-set="-surface pluecker"/>
- <option id="henneberg" _label="Henneberg's Surface" arg-set="-surface henneberg"/>
- <option id="catalan" _label="Catalan's Surface" arg-set="-surface catalan"/>
- <option id="corkscrew" _label="Corkscrew Surface" arg-set="-surface corkscrew"/>
- </select>
+ <vgroup>
+ <select id="surface">
+ <option id="random" _label="Random Surface"/>
+ <option id="dini" _label="Dini's Surface" arg-set="-surface dini"/>
+ <option id="enneper" _label="Enneper's Surface" arg-set="-surface enneper"/>
+ <option id="kuen" _label="Kuen Surface" arg-set="-surface kuen"/>
+ <option id="moebius" _label="Moebius Strip" arg-set="-surface moebius"/>
+ <option id="seashell" _label="Seashell" arg-set="-surface seashell"/>
+ <option id="swallow" _label="Swallowtail" arg-set="-surface swallowtail"/>
+ <option id="bohemian" _label="Bohemian Dome" arg-set="-surface bohemian"/>
+ <option id="whitney" _label="Whitney Umbrella" arg-set="-surface whitney"/>
+ <option id="pluecker" _label="Pluecker's Conoid" arg-set="-surface pluecker"/>
+ <option id="henneberg" _label="Henneberg's Surface" arg-set="-surface henneberg"/>
+ <option id="catalan" _label="Catalan's Surface" arg-set="-surface catalan"/>
+ <option id="corkscrew" _label="Corkscrew Surface" arg-set="-surface corkscrew"/>
+ </select>