https://coding-and-design.blogspot.de/2016/11/simple-way-to-embed-html-in-javasript.html

simple-way-to-embed-html-inside-javascript.js

// Simple way to embed html in javasript
Array.prototype.joinHtml = function () {
	return this.join('');
};

String.prototype.supplant = function (o) {
	return this.replace(/{([^{}]*)}/g,
		function (a, b) {
			var r = o[b];
			return typeof r === 'string' || typeof r === 'number' ? r : a;
		}
	);
};

var html = [
	'<div class="{classes}">',
		'<p>{text}</p>',
	'</div>',
].joinHtml().supplant({
	classes: "class1",
	text: "dummy text"
});

console.log(html); // output: <div class="class1"><p>dummy text</p></div>