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HTML

              
                <div class="app">
	<div class="input-container">
		<input type="text" name="text" id="text" placeholder="Type Here" autocomplete="off">
		<span class="suggestion-container"></span>
		<div class="icons-container">
			<div class="icon tab-key hidden">
				<svg>
					<use xlink:href="#tab-key"></use>
				</svg>
			</div>
			<div class="icon enter-key hidden">
				<svg>
					<use xlink:href="#enter-key"></use>
				</svg>
			</div>
		</div>
	</div>
</div>

<svg class="icons">
	<symbol id="tab-key" viewBox="0 0 448 448">
		<polygon points="225.813,126.187 302.293,202.667 0,202.667 0,245.333 302.293,245.333 225.813,321.813 256,352 384,224 256,96 
							  " />
		<rect x="405.333" y="96" width="42.667" height="256" />
	</symbol>
	<symbol id="enter-key" viewBox="0 0 280.823 280.823">
		<path d="m250.734 40.137-90.265-.02v20.059h90.265c5.534 0 10.029 4.515 10.029 10.049v80.216c0 5.534-4.496
					10.029-10.029 10.029h-212.34l45.877-45.877-14.182-14.182-70.089 70.088 70.206 70.206
					14.182-14.182-45.994-45.994h212.341c16.592 0 30.088-13.497
					30.088-30.088v-80.216c0-16.592-13.497-30.088-30.089-30.088z" />
	</symbol>
</svg>

<div class="support">
	<a href="https://twitter.com/DevLoop01" target="_blank"><i class="fab fa-twitter-square"></i></a>
	<a href="https://dribbble.com/devloop01" target="_blank"><i class="fab fa-dribbble"></i></a>
</div>
              
            
!

CSS

              
                * {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
$selection-color: #222;
$selection-background: rgba(0, 0, 0, 0.12);
::-moz-selection {
	color: $selection-color;
	background: $selection-background;
}
::selection {
	color: $selection-color;
	background: $selection-background;
}

$background-color: #52de97;
body {
	width: 100%;
	height: 100vh;
	overflow: hidden;
	display: flex;
	justify-content: center;
	align-items: center;
	background: $background-color;
}

input {
	outline: none;
	border: 0;
}
.icons {
	display: none;
}

$size: 400px;
$font-size: 18px;
$font-family: "Montserrat";
$padding: 0px 45px 0px 18px;
$text-field-width: 360px;
$text-field-height: 65px;
$border-radius: 10px;

.app {
	width: $size;
	height: $size;
	display: grid;
	place-items: center;

	.input-container {
		position: relative;
		width: $text-field-width;
		height: $text-field-height;
		border-radius: $border-radius;
		background: #fff;
		box-shadow: 0 6.7px 5.3px rgba(0, 0, 0, 0.044), 0 22.3px 17.9px rgba(0, 0, 0, 0.066),
			0 100px 80px rgba(0, 0, 0, 0.11);
		backface-visibility: hidden;
		transform: translateZ(0) scale(1, 1);

		&.animate {
			animation: stretch-animation 800ms ease;
		}

		[type="text"] {
			position: absolute;
			width: $text-field-width;
			height: $text-field-height;
			color: $background-color;
			font-family: $font-family;
			font-size: $font-size;
			letter-spacing: 2px;
			padding: $padding;
			caret-color: #000;
			background: transparent;
			z-index: 5;

			&::placeholder {
				color: rgba(34, 34, 34, 0.55);
			}
		}

		.suggestion-container {
			width: $text-field-width;
			height: $text-field-height;
			position: absolute;
			left: 0;
			top: 0;
			display: flex;
			align-items: center;
			color: #414856;
			opacity: 0.65;
			font-family: $font-family;
			font-size: $font-size;
			letter-spacing: 2px;
			padding: $padding;
			pointer-events: none;
			z-index: 4;
		}

		.icon {
			position: absolute;
			width: 20px;
			height: 20px;
			right: 20px;
			top: 50%;
			transform: translateX(0%) translateY(-50%);
			opacity: 1;
			transition: all 180ms ease-in;
			cursor: pointer;
			pointer-events: all;
			z-index: 10;
			&.hidden {
				transform: translateX(80%) translateY(-50%);
				opacity: 0;
				pointer-events: none;
			}
			svg {
				width: 100%;
				height: 100%;
				fill: #222;
				pointer-events: none;
			}
		}
	}
}

@keyframes stretch-animation {
	0% {
		transform: scale(1, 1);
	}
	10% {
		transform: scale(1.02, 0.98);
	}
	30% {
		transform: scale(0.98, 1.02);
	}
	50% {
		transform: scale(1.02, 0.98);
	}
	100% {
		transform: scale(1, 1);
	}
}

.support{
	position: absolute;
	right: 10px;
	bottom: 10px;
	padding: 10px;
	display: flex;
	a{
		margin: 0 10px;
		color: #e1f2fb;
		font-size: 1.8rem;
		backface-visibility: hidden;
		transition: all 350ms cubic-bezier(0.38,-0.12, 0.24, 1.91);
		&:hover{
			transform: scale(1.1);
		}
	}

}
              
            
!

JS

              
                console.clear();

const inputContainerEl = document.querySelector(".input-container");
const textInputEl = document.querySelector("input#text");
const suggestionEl = document.querySelector(".suggestion-container");
const svgTabIcon = document.querySelector(".icon.tab-key");
const svgEnterIcon = document.querySelector(".icon.enter-key");

const ENTER_KEYCODE = 13;
const TAB_KEYCODE = 9;
const BACKSPACE_KEYCODE = 8;
const UP_ARROW_KEYCODE = 38;
const DOWN_ARROW_KEYCODE = 40;
const SPACE_KEYCODE = 32;

let wordsArray = [
	"hello",
	"world",
	"what",
	"are",
	"you",
	"doing",
	"welloworld",
	"minister",
	"pot",
	"science",
	"rubbish",
	"adjust",
	"presentation",
	"prediction",
	"fate",
	"scholar",
	"pull",
	"string",
	"display",
	"estate",
	"reproduction",
	"scandal",
	"fun",
	"attachment",
	"sailor",
	"queen",
	"sleeve",
	"electron",
	"south",
	"elbow",
	"violation",
	"response",
	"commission",
	"conservation",
	"embryo",
	"explode",
	"car",
	"incentive",
	"snap",
	"mathematics",
	"moral",
	"disco",
	"cluster",
];
let suggestedWord = "";
let suggestedWordsArray = [];
let currentWordIndex = 0;
let insertText = false;

textInputEl.addEventListener("input", e => {
	if (e.data != " ") {
		insertText = true;
	}
	if (insertText == false) {
		textInputEl.value = "";
	}

	let inputValue = e.target.value;
	suggestedWordsArray = filterArray(wordsArray, inputValue);
	suggestedWord = suggestedWordsArray[0];

	if (suggestedWord != undefined) {
		suggestionEl.innerHTML = suggestedWord;
	}

	if (inputValue.length == 0 || suggestedWordsArray.length == 0) {
		suggestionEl.innerHTML = "";
	}

	if (suggestedWordsArray.length != 0) {
		svgTabIcon.classList.remove("hidden");
		svgEnterIcon.classList.add("hidden");
	} else {
		svgTabIcon.classList.add("hidden");
		svgEnterIcon.classList.remove("hidden");
	}

	if (inputValue.length == 0 || inputValue == suggestedWord) {
		svgTabIcon.classList.add("hidden");
		svgEnterIcon.classList.add("hidden");
	}

	if (textInputEl.value.length == 0) {
		insertText = false;
	}
});

textInputEl.addEventListener("keydown", e => {
	if (e.keyCode == ENTER_KEYCODE) {
		if (textInputEl.value.length == 0) return;
		appendTextToList();
	}



	if (textInputEl.value.length != 0 && suggestedWordsArray.length != 0) {
		if (e.keyCode == UP_ARROW_KEYCODE) {
			if (currentWordIndex == 0) return;
			currentWordIndex--;
			suggestionEl.innerHTML = suggestedWordsArray[currentWordIndex];
		}

		if (e.keyCode == DOWN_ARROW_KEYCODE) {
			if (currentWordIndex == suggestedWordsArray.length - 1) return;
			currentWordIndex++;
			suggestionEl.innerHTML = suggestedWordsArray[currentWordIndex];
		}

		if(e.keyCode == UP_ARROW_KEYCODE || e.keyCode == DOWN_ARROW_KEYCODE){
			if (textInputEl.value == suggestedWordsArray[currentWordIndex]) {
				svgTabIcon.classList.add("hidden");
			}else{
				svgTabIcon.classList.remove("hidden");
			}
		}

		if (e.keyCode == BACKSPACE_KEYCODE) {
			currentWordIndex = 0;
		}
	}

	if (suggestedWord != undefined && suggestedWord != "") {
		if (e.keyCode == TAB_KEYCODE) {
			e.preventDefault();
			enterSuggestionToInputEl();
		}
	}
});

svgTabIcon.addEventListener('click', () => {
	enterSuggestionToInputEl();
})

svgEnterIcon.addEventListener('click', () => {
	appendTextToList();
})

removeClassAfterAnimationCompletes(inputContainerEl, "animate");

function appendTextToList(){
	let inputValue = textInputEl.value;
	let words = inputValue.split(" ");
	for (let i in words) {
		if (words[i].length != 0) {
			wordsArray.push(words[i]);
			textInputEl.value = "";
			suggestionEl.innerHTML = "";
		}
	}
	wordsArray = removeDuplicatesFromArray(wordsArray);
	currentWordIndex = 0;
	suggestedWordsArray = [];
	inputContainerEl.classList.add("animate");
	svgTabIcon.classList.add("hidden");
	svgEnterIcon.classList.add("hidden");
	removeClassAfterAnimationCompletes(inputContainerEl, "animate");
}

function enterSuggestionToInputEl(){
	textInputEl.value = suggestedWordsArray[currentWordIndex];
	suggestionEl.innerHTML = "";
	svgTabIcon.classList.add("hidden");
	svgEnterIcon.classList.add("hidden");
}

function removeClassAfterAnimationCompletes(el, className) {
	let elStyles = window.getComputedStyle(inputContainerEl);
	setTimeout(function() {
		el.classList.remove(className);
	}, +elStyles.animationDuration.replace("s", "") * 1000);
}

function filterArray(array, item, reverse = false) {
	if (reverse) {
		return array
			.filter(word => returnSubstring(word, item))
			.sort((a, b) => a.length - b.length);
	} else {
		return array
			.filter(word => returnSubstring(word, item))
			.sort((a, b) => b.length - a.length);
	}
}

function removeDuplicatesFromArray(array) {
	return [...new Set(array.map(i => i))];
}

function returnSubstring(string, subString) {
	let temp = string.split("", subString.length).join("");
	if (subString == temp) return subString;
}
              
            
!
999px

Console