title: input checkbox checked by default?
body: <p>I have this code:</p>
  
  <pre><code>&lt;div class="checkbox"&gt;
      &lt;label&gt;
          &lt;input type="checkbox" data-bind="checked: params.availToStream"&gt;
          {{ trans('stream::main.onlyAvailToStream') }} 
      &lt;/label&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I want to have the <code>checkbox</code> checked by default, I have tried the following but cannot get it to work.</p>
  
  <pre><code>&lt;input type="checkbox" data-bind="checked: params.availToStream" selected&gt;
  </code></pre>
  
  
  
  <pre><code>&lt;input type="checkbox" data-bind="checked: params.availToStream" checked="checked"&gt;
  </code></pre>
  
  
  
  <pre><code>&lt;input type="checkbox" data-bind="checked: params.availToStream" checked&gt;
  </code></pre>