title: style.border error in angular4
body: <p>I'm working with angular 4 and when I use this: </p>
  
  <pre><code>&lt;pre [style.border="color_seleccionado=='red' ? '5px solid black' :'1px solid white'"]&gt;
  </code></pre>
  
  <p>I have the following error:</p>
  
  <pre><code> EmpleadoComponent.html:6 ERROR DOMException: Failed to execute 'setAttribute' on 'Element': '[style.border' is not a valid attribute name
  </code></pre>
  
  <p>I have imported this: 
      import {FormsModule} from '@angular/forms';
      import {HttpModule} from '@angular/http';</p>
  
  <p>And I have done it on app.modules.ts and It doesn't work, why?. Thanks</p>