loadfonts.js

function loadFont(t, e, n) {
	return new Promise(resolve => {
		const a = navigator.userAgent;
		if (window.addEventListener && (!a.match(/(Android (2|3|4.0|4.1|4.2|4.3))|(Opera (Mini|Mobi))/) || a.match(/Chrome/))) {
			let o = {};
			try {
				o = localStorage || {}
			} catch (t) {}
			const r = t, i = r + "url", s = r + "css", d = o[i], c = o[s], l = document.createElement("style");
			if (l.rel = "stylesheet", document.head.appendChild(l), !c || d !== e && d !== n) {
				const u = n && function () {
					if (!window.FontFace) return !1;
					const t = new FontFace("t", 'url("data:application/font-woff2,") format("woff2")', {});
					return t.load(), "loading" === t.status
				}() ? n : e, f = new XMLHttpRequest;
				f.open("GET", u), f.onload = function () {
					f.status >= 200 && f.status < 400 && (o[i] = u, o[s] = l.textContent = f.responseText)
					resolve();
				}, f.send()
			} else {
				l.textContent = c;
				resolve();
			}
		}
	});
}

loadFont('Affogato-1.0', '/assets/fonts/font-woff.css', '/assets/fonts/font-woff2.css').then(() => {
	console.log('font loaded');
});