#### Bug, feature request, or proposal: Bug? #### What is the expected behavior? if you use the md-fab directive on a button the primary background color is set if you use it on a <a> link it'ts not #### What is the current behavior? Same behavior should be for <a> as it is for <button> #### What are the steps to reproduce? ``` <a md-fab href="http://orderlink" target="_blank"> <md-icon class="md-24">add_shopping_cart</md-icon> </a> ``` vs ``` <button md-fab (click)="openUploadDocumentDialog()" [disabled]="dialogRef"> <md-icon class="md-24">add</md-icon> </button> ``` #### What is the use-case or motivation for changing an existing behavior? #### Which versions of Angular, Material, OS, browsers are affected? #### Is there anything else we should know?