Spirit-act/style.css

## style.css
body {
  background-color: #222;
  color: white;
}
.input-wrapper{
  background: transparent;
  padding: 10px;
  border-radius: 4px;
  border: 1px solid #ccc
}
.input-wrapper input{
  border: none;
  background: transparent;
  outline: none;
  width: 140px;
  margin-left: 8px;
  color: white;
}
.input-wrapper .tag{
  display: inline-block;
  background-color: limegreen;
  color: white;
  border-radius: 2px;
  padding: 0px 3px 0px 7px;
  margin-right: 5px;
}
.input-wrapper .tag a {
  margin: 0 7px 3px;
  display: inline-block;
  cursor: pointer;
}

## tags.html
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <form>
            <div class="input-wrapper" id="wrapper">
                <input type="text" id="wrapper-input">
            </div>
            <input type="text" id="names" hidden=true>
        </form>
        <script src="tags.js"></script>
    </body>
</html>

## tags.js
class TagsInput {
    constructor() {
        this.tags = [];
        this.el = document.getElementById("wrapper");
        this.input = document.getElementById("wrapper-input");
        this.input.addEventListener("keydown", (e) => {
            if (!!~["Tab", "Enter", "NumpadDecimal"].indexOf(e.code)) {
                e.preventDefault();
                let str = this.input.value.trim();
                this.input.value = "";
                if (str != "") {
                    this.add(str);
                }
            }
        });
    }

    add(tag) {
        this.tags.push(tag);
        this.render();
        this.sendEvent(this.tags);
    }

    render() {
        this.removeAllChildren();
        this.tags.forEach((item) => {
            let tag = document.createElement("span");
            tag.className = "tag";
            tag.innerText = item;
            let ci = document.createElement("a");
            ci.innerHTML = "&times;";
            ci.addEventListener("click", (e) => {
                const index = this.tags.indexOf(e.target.parentNode.firstChild.textContent);
                if (index > -1) {
                    this.tags.splice(index, 1);
                    e.target.parentNode.remove();
                    this.sendEvent(this.tags);
                }
            });
            tag.appendChild(ci);
            this.el.insertBefore(tag, this.input);
        });
    }

    removeAllChildren() {
        while (this.el.firstChild.id !== "wrapper-input") {
            this.el.firstChild.remove();
        }
    }

    sendEvent(detail) {
        document.dispatchEvent(
            new CustomEvent("userUpdate", { detail: detail })
        );
    }

    getElements() {
        return this.tags;
    }
}

const x = new TagsInput();
x.add('tag1');
x.add('tag-2');
x.add('tag_3');
	body {
	background-color: #222;
	color: white;
	}
	.input-wrapper{
	background: transparent;
	padding: 10px;
	border-radius: 4px;
	border: 1px solid #ccc
	}
	.input-wrapper input{
	border: none;
	background: transparent;
	outline: none;
	width: 140px;
	margin-left: 8px;
	color: white;
	}
	.input-wrapper .tag{
	display: inline-block;
	background-color: limegreen;
	color: white;
	border-radius: 2px;
	padding: 0px 3px 0px 7px;
	margin-right: 5px;
	}
	.input-wrapper .tag a {
	margin: 0 7px 3px;
	display: inline-block;
	cursor: pointer;
	}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<link rel="stylesheet" href="style.css">
	</head>
	<body>
	<form>
	<div class="input-wrapper" id="wrapper">
	<input type="text" id="wrapper-input">
	</div>
	<input type="text" id="names" hidden=true>
	</form>
	<script src="tags.js"></script>
	</body>
	</html>
	class TagsInput {
	constructor() {
	this.tags = [];
	this.el = document.getElementById("wrapper");
	this.input = document.getElementById("wrapper-input");
	this.input.addEventListener("keydown", (e) => {
	if (!!~["Tab", "Enter", "NumpadDecimal"].indexOf(e.code)) {
	e.preventDefault();
	let str = this.input.value.trim();
	this.input.value = "";
	if (str != "") {
	this.add(str);
	}
	}
	});
	}

	add(tag) {
	this.tags.push(tag);
	this.render();
	this.sendEvent(this.tags);
	}

	render() {
	this.removeAllChildren();
	this.tags.forEach((item) => {
	let tag = document.createElement("span");
	tag.className = "tag";
	tag.innerText = item;
	let ci = document.createElement("a");
	ci.innerHTML = "×";
	ci.addEventListener("click", (e) => {
	const index = this.tags.indexOf(e.target.parentNode.firstChild.textContent);
	if (index > -1) {
	this.tags.splice(index, 1);
	e.target.parentNode.remove();
	this.sendEvent(this.tags);
	}
	});
	tag.appendChild(ci);
	this.el.insertBefore(tag, this.input);
	});
	}

	removeAllChildren() {
	while (this.el.firstChild.id !== "wrapper-input") {
	this.el.firstChild.remove();
	}
	}

	sendEvent(detail) {
	document.dispatchEvent(
	new CustomEvent("userUpdate", { detail: detail })
	);
	}

	getElements() {
	return this.tags;
	}
	}

	const x = new TagsInput();
	x.add('tag1');
	x.add('tag-2');
	x.add('tag_3');