Laravel 5.3注释掉@extends（'layout.app'）仍然生效并包含在显示中

I'm using PHPStorm as IDE for creating Laravel pages. I actually just started learning it. However, I noticed that even if I comment out the @extends('layout.app') like {{--@extends('layout.app')--}} somehow it still reads the html and includes the app.blade.php as display on the browser.

To better explain, here are the codes.

Controller.php

public function showContactPage()
{
    $people = ['Hello', 'World', 'Ashton', 'Alvin'];
    return view('contact', compact('people')); 
}

app.blade.php

<html>
<head>
    <title>Blade Templating Sample</title>
</head>
<body>

<div class="container">
    @yield('content')
</div>

</body>

</html>

contact.blade.php

{{--@extends('layout.app')--}}

@section('content')
    <h1>Contact Page</h1>

    @if(count($people))
        <ul>
            @foreach($people as $person)
                <li>{{$person}}</li>
            @endforeach
        </ul>
    @endif

@stop

Output on browser

enter image description here

View Page Source codes

<html>
<head>
    <title>Blade Templating Sample</title>
</head>
<body>

<div class="container">
        <h1>Contact Page</h1>
            <ul>
                 <li>Hello</li>
                 <li>World</li>
                 <li>Ashton</li>
                 <li>Alvin</li>
            </ul>
</div>
</body>

</html>

If you look on the page sources html code, it still shows what's in app.blade.php even if I commented out the {{--@extends('layout.app')--}} in contact.blade.php

I don't know if it's an issue with PHPStorm or the browser or if it is something I should expect as result after commenting out the @extends

Or maybe with Laravel 5.3

I'd appreciate any thoughts or explanation to this.

Thank you.