```html
<!DOCTYPE html>
     <html>
     <head>
          <title>Page Title</title>
     </head>
<body>

     <h1>This is a Heading</h1>
     <p>This is a paragraph.</p>

</body>
</html>
```

Skeleton of an HTML Document

You can write HTML code in a code node on 1Cademy. Enter your code between triple backticks (```), and precede the opening backticks with the string "html". For example:

```html
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>
<h1>This is a Heading</h1>
<p>This is a paragraph.</p>
</body>
</html>
```

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Examples of Code Nodes on 1Cademy

HTML Code Nodes on 1Cademy

You can write JavaScript code in a code node. For this purpose, you should enter your code in triple backthicks (\`\`\`). You should proceed the beginning backticks with the string "js". For example,
```js
document.getElementById("demo").innerHTML = "Hello JavaScript";
console.log(1234);
```

JavaScript Code Nodes on 1Cademy

You can write Python code in a code node. To do so, enter your code inside triple backticks (```), preceding the opening backticks with the string "Python". For example:

```Python
def fib(n):
    a, b = 0, 1
    while a < n:
        print(a, end=' ')
        a, b = b, a+b
    print()
fib(1000)
```

Python Code Nodes on 1Cademy

Example of a Python Code Node on 1Cademy

Example of an HTML Code Node on 1Cademy

Example of an R Code Node on 1Cademy

Example of a JavaScript Code Node on 1Cademy

To format R code in a 1Cademy code node, place the code between triple backticks and write `R` immediately after the opening backticks. For example:

```R
n = c(2, 3, 5)
s = c("aa", "bb", "cc")
b = c(TRUE, FALSE, TRUE)
df = data.frame(n, s, b)
```

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