What's wrong with my code, seems like required attribute is not working, even If first option, that has "" value, is selected you can push submit and move forward. Here is the code:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
  <title>Choose</title>
</head>
<body>
         <form method="post" action="page.php">
        <select name="blabla" required>
            <option value="">Choose</option>
            <?php
            foreach($blazz as $blaz){
            ?>
            <option value="<?php echo $blaz ?>"><?php echo $blaz ?></option>
            <?php
            } 
            ?>
            </select>
            <button  type='submit' name="tvt"  value="ok" class="button">Submit</button>
            </form>
</body>
</html>
 
     
    