Page Title

Wrong*

hi

there

var el = document.getElementsByTagName("div"); document.write(el.length);

* reason: some syntax errors.

Right

hi

there

Output

The output is 'hi hello 4', because you wrote these 2 words ('hi hello') in html and in a div tag.
In your code, you forgot to add the script tag to use JavaScript in your code.

Your Javascript code gets the tag named 'div', in this case the div containing 'hello' (because the other tag isn't closed so it won't get that element).

The last output is 4 because 'Hello' (the text in the div tag, get before with your js code), and outputs its length with 'el.length', el -> the variable containing your div tag.

Explaination