title: textarea does not work in angular6
body: <p>I am using angular 6 and I try to put a textarea in a form.</p>
  
  <p>This is my code so far</p>
  
  <pre><code>&lt;textarea rows="20" cols="50" id="mailtext" required [(ngModel)]="mailtext" name="mailtext" #mailtextvalidityMsg="ngModel" &gt;Hi there&lt;/textarea&gt;
  </code></pre>
  
  <p>I can see the text area in the html, but the "Hi there" text is not rendered. I dont get any errors in my console.</p>
  
  <p>If I remove the <code>[(ngModel)]="mailtext" name="mailtext" #mailtextvalidityMsg="ngModel"</code> it works. </p>
  
  <p>This is happening only for the textarea. For other fields in the same form, such as <code>input type="email"</code>, there is no problem.</p>
  
  <p>What am I missing? </p>
  
  <p>Thanks</p>
  
  <p>EDIT</p>
  
  <p>I forgot to mention that I want to have line breaks and a link in the textarea, something like</p>
  
  <pre><code>Hi there , 
  
  this is the code you have to use 
  
  Click here
  </code></pre>
  
  <p>I want to have line breaks and the <code>Click here</code> must be a link</p>
  
  <p>If I do </p>
  
  <pre><code>mailtext:any;
  this.mailtext = 'Hi there,'+&lt;br&gt;+'this is the code you have to use';
  </code></pre>
  
  <p>I get <code>Hi there,NaN</code></p>
  
  <p>Thanks</p>