# Task completion for a checklist in JavaScript

Attach an event to the button `'done'` in the same way:

`let mark = document.createElement('span'); mark.classList.add('mark'); mark.textContent = 'done'; mark.addEventListener('click', function() { // here will be the code for marking the task as done }); li.appendChild(mark);`

In order to mark the task as done, you need to attach some CSS class to the corresponding `li` tag. Let's name, for example, this class - `done`.

Then for this class you can write the corresponding CSS code:

`#list .done { text-decoration: line-through; }`

Add the missing part of the code to solve the described problem.

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