Trying to use PHP in HTML?

I'm using Wamp server to code a website on my PC, I'm following a tutorial on W3Schools for <form> and data collection with PHP (the GET method) and even though I followed the tutorial the code doesn't work.

I researched it a little here but no one seems to be able to answer my problem.

<form action="welcome_get.php">
  <section class="contact bg-primary" id="contact">
    <div class="container">
      <h2>Abonnez vous par mail!</h2>
      <input type="email" id="email" size="50" placeholder="Entrez votre adresse e-mail"></input>
    </div>
    <div class="mail-submit">
      <input type="submit" id="submit" value="Je m'abonne"></input>
    </div>
  </section>
</form>

That is the HTML before I send the email address, and this is the simple page to GET the email:

<html>
<body>
Your email address is: <?php echo $_GET["email"]; ?>
</body>
</html>

Yet it doesn't work at all. Here is the tutorial i followed

https://www.w3schools.com/php/php_forms.asp

Update

I made a mistake. I was opening the FILE through my browser NOT accessing through Wampserver.

Now the issue is when I click on Submit button (that calls the <form action="welcome_get.php" method="get">) it downloads the welcome_get.php.

Solution

First : add method GET

<form action="welcome_get.php" method="get">

Second : add attributte name in input

<input type="email" name="email" id="email" size="50" placeholder="Entrez votre adresse e-mail"></input>

Final : make sure your extension is .php not .html