Can someone explain me the following code, I'm new to angular please help me : 

```
{% if validation_error %}
   <div>{{ validation_error }}</div>
{% endif %}  

```

On web page :

[![enter image description here](https://i.stack.imgur.com/C0HL1.png)](https://i.stack.imgur.com/C0HL1.png) 

Full code :

```
<form name="login" method="POST" action="/app/login">
    <div class="form-container">
        <fieldset class="form-group">
            <input class="form-control form-control-sm text-uppercase" id="username" name="username" type="text" placeholder="Username">
            <input class="form-control form-control-sm" name="password" type="password" placeholder="Password">
        </fieldset>
        <button class="btn btn-primary btn-sm btn-block">signin</button>
        {% if validation_error %}
            <div class="small text-danger m-t-1">{{ validation_error }}</div>
        {% endif %}
    </div>
</form>

```