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HTML

              
                <body>
	<div class="container">
		<div class="row">
			<div class="intro col-12">
				<h1>Work To-Dos</h1>
				<div>
					<div class="border1"></div>
					<div c
				</div>
			</div>
		</div>

		<div class="row">
			<div class="helpText col-12">
				<p id="first">Enter text into the input field to add items to your list.</p>
				<p id="second">Click the item to mark it as complete.</p>
				<p id="third">Click the "X" to remove the item from your list.</p>
			</div>
		</div>

		<div class="row">
			<div class="col-12">
				<input id="userInput" type="text" placeholder="New item..." maxlength="27">
				<button id="enter"><i class="fas fa-pencil-alt"></i></button>
			</div>
		</div>

		<!-- Empty List -->
		<div class="row">
			<div class="listItems col-12">
				<ul class="col-12 offset-0 col-sm-8 offset-sm-2">
				</ul>
			</div>
		</div>

	</div>
	<script type="text/javascript" src="script_method3.js"></script>
</body>
</html>
              
            
!

CSS

              
                body {
	background: #04A1BF;
	text-align: center;
	font-family: 'Open Sans', sans-serif;
}

.intro {
	margin: 30px 0px;
	font-weight: bold;
}

h1 {
	color: #ffffff;
	text-transform: uppercase;
	font-weight: 800;
}

p {
	font-weight: 600;
}

#first {
	margin-top: 10px;
	color: #FFCD5D;
}

#second {
	color: #51DF70;

}

#third {
	color: #025F70;
	margin-bottom: 30px;
}


#enter {
	border: none;
	padding: 5px 15px;
	border-radius: 5px;
	color: #04A1BF;
	background-color: #025F70;
	transition: all 0.75s ease;
	-webkit-transition: all 0.75s ease;
	-moz-transition: all 0.75s ease;
	-ms-transition: all 0.75s ease;
	-o-transition: all 0.75 ease;
	font-weight: normal;
}

#enter:hover{
	background-color: #02798F;
	color: #FFCD5D;
}

ul {
	text-align: left;
	margin-top: 20px;
}


li {
	list-style: none;
	padding: 10px 20px;
	color: #ffffff;
	text-transform: capitalize;
	font-weight: 600;
	border: 2px solid #025f70;
	border-radius: 5px;
	margin-bottom: 10px;
	background: #4EB9CD;
	transition: all 0.75s ease;
	-webkit-transition: all 0.5s ease;
	-moz-transition: all 0.5s ease;
	-ms-transition: all 0.5s ease;
	-o-transition: all 0.5 ease;
}

li:hover {
	background: #76CFE0;
}

li > button {
	font-weight: normal;
	background: none;
	border: none;
	float: right;
	color: #025f70;
	font-weight: 800;
}

input {
	border-radius: 5px;
	min-width: 65%;
	padding: 5px;
	border: none;
}


.done {
	background: #51DF70 !important;
	color: #00891E;
}

.delete {
	display: none;
}
              
            
!

JS

              
                var enterButton = document.getElementById("enter");
var input = document.getElementById("userInput");
var ul = document.querySelector("ul");
var item = document.getElementsByTagName("li");

function inputLength(){
	return input.value.length;
} 

function listLength(){
	return item.length;
}

function createListElement() {
	var li = document.createElement("li"); // creates an element "li"
	li.appendChild(document.createTextNode(input.value)); //makes text from input field the li text
	ul.appendChild(li); //adds li to ul
	input.value = ""; //Reset text input field


	//START STRIKETHROUGH
	// because it's in the function, it only adds it for new items
	function crossOut() {
		li.classList.toggle("done");
	}

	li.addEventListener("click",crossOut);
	//END STRIKETHROUGH


	// START ADD DELETE BUTTON
	var dBtn = document.createElement("button");
	dBtn.appendChild(document.createTextNode("X"));
	li.appendChild(dBtn);
	dBtn.addEventListener("click", deleteListItem);
	// END ADD DELETE BUTTON


	//ADD CLASS DELETE (DISPLAY: NONE)
	function deleteListItem(){
		li.classList.add("delete")
	}
	//END ADD CLASS DELETE
}


function addListAfterClick(){
	if (inputLength() > 0) { //makes sure that an empty input field doesn't create a li
		createListElement();
	}
}

function addListAfterKeypress(event) {
	if (inputLength() > 0 && event.which ===13) { //this now looks to see if you hit "enter"/"return"
		//the 13 is the enter key's keycode, this could also be display by event.keyCode === 13
		createListElement();
	} 
}


enterButton.addEventListener("click",addListAfterClick);

input.addEventListener("keypress", addListAfterKeypress);


              
            
!
999px

Console