use icon button

Author: mmalerba

src/material-examples/input-clearable/input-clearable-example.html

@@ -1,4 +1,6 @@
 <md-input-container class="example-input-container">
   <input mdInput type="text" placeholder="Clearable input" [(ngModel)]="value"/>
-  <md-icon mdSuffix *ngIf="value" (click)="value=''">close</md-icon>
+  <md-button *ngIf="value" mdSuffix md-icon-button aria-label="Clear" (click)="value=''">
+    <md-icon>close</md-icon>
+  </md-button>
 </md-input-container>