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body {
  background-color: #FFF; 
  font-size: 16px;
}
h1 {
  font-size: 2rem;
}
p {
  font-family: Verdana,sans-serif;
}

<button onclick="demoFunc()">Click Me!</button>
<script>
  function demoFunc() {
    let p = document.getElementById("p");
    p.textContent = "You changed this text!";
    p.style.fontSize = "20px";
    p.style.color = "blue";
  }
</script>

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.send('Hello Express.js!');
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

<?php
echo "Hello, I'm a PHP script!";
function demoFunc()
{
  echo "It works.";
  echo "Today's date is " . date('Y-m-d');
  echo "Have a great day!";
}
demoFunc();
?>

-- Retrieve active users
SELECT userID, 
       CONCAT(firstName, ' ', lastName) AS name, 
       email,
       registrationDate
FROM users
WHERE status = 1;
-- End of query
-- Output: userID, name, email, registrationDate

def greet():
  return '''Welcome to Python!
It's easy to learn.'''

message = greet()
print(message)

public class Greet {
  static String greet() {
    return "Welcome to Java!";
  }

  public static void main(String[] args) {
    System.out.println(greet());
    System.out.println("It's easy to learn.");
  }
}

<%@ page contentType="text/html; charset=UTF-8"%>
<html>
<head>
  <title>Quick JSP Demo</title>
</head>
<body>
  <p>Hello, I'm a JSP script!</p>
  <% out.println("Today's date is " + new java.util.Date()); %>
</body>
</html>

#include<stdio.h>

int main()
{
  printf("First C Program.\n");
  return 0;
}

#include <iostream> 

int main()
{
 std::cout<<"First C++ Program.";
 std::cout<<std::endl<<"Its easy to learn.";
}

{
  "user": {
    "name": "User name",
    "active": true
  }

<user>
  <name>User name</name>
  <active>true</active>
</user>