message to say "Here is the message".
This works by adding the following code within the click event:
document.getElementsByClassName('message')[0].textContent="Here is the message";
onclick event handler to change the text inside the message element to say "Here is the message".
document.getElementsByClassName method to select the element with class message and set its textContent to the given string.
testString: assert(code.match(/document\s*\.getElementsByClassName\(\s*?('|")message\1\s*?\)\[0\]\s*\.textContent\s*?=\s*?('|")Here is the message\2/g), 'Your code should use the document.getElementsByClassName method to select the element with class message and set its textContent to the given string.');
```
```