md2/select/optgroup.html

Angular2 based Material Design components, directives and services are Accordion, Autocomplete, Chips(Tags), Collapse, Colorpicker, Data Table, Datepicker, Dialog(Modal), Menu, Multiselect, Select, Tabs, Tags(Chips), Toast and Tooltip.

<label class="md2-optgroup-label" [id]="_labelId">{{ label }}</label><ng-content select="md2-option"></ng-content>