title: css - use attribute selector or set class name?
body: <p>Should we use </p>
  
  <pre><code>css: input[type='submit']{...}
  </code></pre>
  
  <p>or set class name for input tag?</p>
  
  <pre><code>html: &lt;input type="submit" class="submit"&gt;
  css: .submit{...}
  </code></pre>