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font-load-example.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Critical FOFT with preload (polyfill)</title>
<link rel="preload" href="font-lato/lato-zachleat-optimized.woff2" as="font" type="font/woff2" crossorigin>
<style>
@font-face {
font-family: LatoSubset;
src: url('font-lato/lato-zachleat-optimized.woff2') format('woff2'),
url('font-lato/lato-zachleat-optimized.woff') format('woff');
unicode-range: U+65-90, U+97-122;
}
@font-face {
font-family: Lato;
src: url('font-lato/lato-regular-webfont.woff2') format('woff2'),
url('font-lato/lato-regular-webfont.woff') format('woff');
}
@font-face {
font-family: LatoBold;
src: url('font-lato/lato-bold-webfont.woff2') format('woff2'),
url('font-lato/lato-bold-webfont.woff') format('woff');
font-weight: 700;
}
@font-face {
font-family: LatoItalic;
src: url('font-lato/lato-italic-webfont.woff2') format('woff2'),
url('font-lato/lato-italic-webfont.woff') format('woff');
font-style: italic;
}
@font-face {
font-family: LatoBoldItalic;
src: url('font-lato/lato-bolditalic-webfont.woff2') format('woff2'),
url('font-lato/lato-bolditalic-webfont.woff') format('woff');
font-weight: 700;
font-style: italic;
}
body {
font-family: sans-serif;
}
.fonts-stage-1 body {
font-family: LatoSubset, sans-serif;
font-weight: 400;
font-style: normal;
}
.fonts-stage-2 body {
font-family: Lato, sans-serif;
}
.fonts-stage-2 h1,
.fonts-stage-2 strong {
font-family: LatoBold, sans-serif;
font-weight: 700;
}
.fonts-stage-2 em {
font-family: LatoItalic, sans-serif;
font-style: italic;
}
.fonts-stage-2 strong em,
.fonts-stage-2 em strong {
font-family: LatoBoldItalic, sans-serif;
font-weight: 700;
font-style: italic;
}
</style>
<script>
(function () {
// Optimization for Repeat Views
if (sessionStorage.fontsLoadedCriticalFoftPreloadPolyfill) {
document.documentElement.className += " fonts-stage-2";
return;
}
/* Font Face Observer v2.0.13 - © Bram Stein. License: BSD-3-Clause */
(function () {
'use strict';
var f, g = [];
function l(a) {
g.push(a);
1 == g.length && f()
}
function m() {
for (; g.length;) g[0](), g.shift()
}
f = function () {
setTimeout(m)
};
function n(a) {
this.a = p;
this.b = void 0;
this.f = [];
var b = this;
try {
a(function (a) {
q(b, a)
}, function (a) {
r(b, a)
})
} catch (c) {
r(b, c)
}
}
var p = 2;
function t(a) {
return new n(function (b, c) {
c(a)
})
}
function u(a) {
return new n(function (b) {
b(a)
})
}
function q(a, b) {
if (a.a == p) {
if (b == a) throw new TypeError;
var c = !1;
try {
var d = b && b.then;
if (null != b && "object" == typeof b && "function" == typeof d) {
d.call(b, function (b) {
c || q(a, b);
c = !0
}, function (b) {
c || r(a, b);
c = !0
});
return
}
} catch (e) {
c || r(a, e);
return
}
a.a = 0;
a.b = b;
v(a)
}
}
function r(a, b) {
if (a.a == p) {
if (b == a) throw new TypeError;
a.a = 1;
a.b = b;
v(a)
}
}
function v(a) {
l(function () {
if (a.a != p)
for (; a.f.length;) {
var b = a.f.shift(),
c = b[0],
d = b[1],
e = b[2],
b = b[3];
try {
0 == a.a ? "function" == typeof c ? e(c.call(void 0, a.b)) : e(a.b) : 1 == a.a && (
"function" == typeof d ? e(d.call(void 0, a.b)) : b(a.b))
} catch (h) {
b(h)
}
}
})
}
n.prototype.g = function (a) {
return this.c(void 0, a)
};
n.prototype.c = function (a, b) {
var c = this;
return new n(function (d, e) {
c.f.push([a, b, d, e]);
v(c)
})
};
function w(a) {
return new n(function (b, c) {
function d(c) {
return function (d) {
h[c] = d;
e += 1;
e == a.length && b(h)
}
}
var e = 0,
h = [];
0 == a.length && b(h);
for (var k = 0; k < a.length; k += 1) u(a[k]).c(d(k), c)
})
}
function x(a) {
return new n(function (b, c) {
for (var d = 0; d < a.length; d += 1) u(a[d]).c(b, c)
})
};
window.Promise || (window.Promise = n, window.Promise.resolve = u, window.Promise.reject = t, window.Promise
.race = x, window.Promise.all = w, window.Promise.prototype.then = n.prototype.c, window.Promise
.prototype["catch"] = n.prototype.g);
}());
(function () {
function l(a, b) {
document.addEventListener ? a.addEventListener("scroll", b, !1) : a.attachEvent("scroll", b)
}
function m(a) {
document.body ? a() : document.addEventListener ? document.addEventListener("DOMContentLoaded",
function c() {
document.removeEventListener("DOMContentLoaded", c);
a()
}) : document.attachEvent("onreadystatechange", function k() {
if ("interactive" == document.readyState || "complete" == document.readyState) document.detachEvent(
"onreadystatechange", k), a()
})
};
function r(a) {
this.a = document.createElement("div");
this.a.setAttribute("aria-hidden", "true");
this.a.appendChild(document.createTextNode(a));
this.b = document.createElement("span");
this.c = document.createElement("span");
this.h = document.createElement("span");
this.f = document.createElement("span");
this.g = -1;
this.b.style.cssText =
"max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
this.c.style.cssText =
"max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
this.f.style.cssText =
"max-width:none;display:inline-block;position:absolute;height:100%;width:100%;overflow:scroll;font-size:16px;";
this.h.style.cssText = "display:inline-block;width:200%;height:200%;font-size:16px;max-width:none;";
this.b.appendChild(this.h);
this.c.appendChild(this.f);
this.a.appendChild(this.b);
this.a.appendChild(this.c)
}
function t(a, b) {
a.a.style.cssText =
"max-width:none;min-width:20px;min-height:20px;display:inline-block;overflow:hidden;position:absolute;width:auto;margin:0;padding:0;top:-999px;white-space:nowrap;font-synthesis:none;font:" +
b + ";"
}
function y(a) {
var b = a.a.offsetWidth,
c = b + 100;
a.f.style.width = c + "px";
a.c.scrollLeft = c;
a.b.scrollLeft = a.b.scrollWidth + 100;
return a.g !== b ? (a.g = b, !0) : !1
}
function z(a, b) {
function c() {
var a = k;
y(a) && a.a.parentNode && b(a.g)
}
var k = a;
l(a.b, c);
l(a.c, c);
y(a)
};
function A(a, b) {
var c = b || {};
this.family = a;
this.style = c.style || "normal";
this.weight = c.weight || "normal";
this.stretch = c.stretch || "normal"
}
var B = null,
C = null,
E = null,
F = null;
function G() {
if (null === C)
if (J() && /Apple/.test(window.navigator.vendor)) {
var a = /AppleWebKit\/([0-9]+)(?:\.([0-9]+))(?:\.([0-9]+))/.exec(window.navigator.userAgent);
C = !!a && 603 > parseInt(a[1], 10)
} else C = !1;
return C
}
function J() {
null === F && (F = !!document.fonts);
return F
}
function K() {
if (null === E) {
var a = document.createElement("div");
try {
a.style.font = "condensed 100px sans-serif"
} catch (b) {}
E = "" !== a.style.font
}
return E
}
function L(a, b) {
return [a.style, a.weight, K() ? a.stretch : "", "100px", b].join(" ")
}
A.prototype.load = function (a, b) {
var c = this,
k = a || "BESbswy",
q = 0,
D = b || 3E3,
H = (new Date).getTime();
return new Promise(function (a, b) {
if (J() && !G()) {
var M = new Promise(function (a, b) {
function e() {
(new Date).getTime() - H >= D ? b() : document.fonts.load(L(c, '"' + c.family + '"'), k)
.then(function (c) {
1 <= c.length ? a() : setTimeout(e, 25)
}, function () {
b()
})
}
e()
}),
N = new Promise(function (a, c) {
q = setTimeout(c, D)
});
Promise.race([N, M]).then(function () {
clearTimeout(q);
a(c)
}, function () {
b(c)
})
} else m(function () {
function u() {
var b;
if (b = -1 !=
f && -1 != g || -1 != f && -1 != h || -1 != g && -1 != h)(b = f != g && f != h && g !=
h) || (null === B && (b = /AppleWebKit\/([0-9]+)(?:\.([0-9]+))/.exec(window.navigator
.userAgent), B = !!b && (536 > parseInt(b[1], 10) || 536 === parseInt(b[1], 10) &&
11 >= parseInt(b[2], 10))), b = B && (f == v && g == v && h == v || f == w && g ==
w && h == w || f == x && g == x && h == x)), b = !b;
b && (d.parentNode && d.parentNode.removeChild(d), clearTimeout(q), a(c))
}
function I() {
if ((new Date).getTime() - H >= D) d.parentNode && d.parentNode.removeChild(d), b(c);
else {
var a = document.hidden;
if (!0 === a || void 0 === a) f = e.a.offsetWidth,
g = n.a.offsetWidth, h = p.a.offsetWidth, u();
q = setTimeout(I, 50)
}
}
var e = new r(k),
n = new r(k),
p = new r(k),
f = -1,
g = -1,
h = -1,
v = -1,
w = -1,
x = -1,
d = document.createElement("div");
d.dir = "ltr";
t(e, L(c, "sans-serif"));
t(n, L(c, "serif"));
t(p, L(c, "monospace"));
d.appendChild(e.a);
d.appendChild(n.a);
d.appendChild(p.a);
document.body.appendChild(d);
v = e.a.offsetWidth;
w = n.a.offsetWidth;
x = p.a.offsetWidth;
I();
z(e, function (a) {
f = a;
u()
});
t(e, L(c, '"' + c.family + '",sans-serif'));
z(n, function (a) {
g = a;
u()
});
t(n, L(c, '"' + c.family + '",serif'));
z(p, function (a) {
h = a;
u()
});
t(p, L(c, '"' + c.family + '",monospace'))
})
})
};
"object" === typeof module ? module.exports = A : (window.FontFaceObserver = A, window.FontFaceObserver
.prototype.load = A.prototype.load);
}());
var fontASubset = new FontFaceObserver('LatoSubset');
Promise.all([fontASubset.load(null, 10000)]).then(function () {
document.documentElement.className += " fonts-stage-1";
var fontA = new FontFaceObserver('Lato');
var fontB = new FontFaceObserver('LatoBold', {
weight: 700
});
var fontC = new FontFaceObserver('LatoItalic', {
style: 'italic'
});
var fontD = new FontFaceObserver('LatoBoldItalic', {
weight: 700,
style: 'italic'
});
Promise.all([
fontA.load(null, 10000),
fontB.load(null, 10000),
fontC.load(null, 10000),
fontD.load(null, 10000)
]).then(function () {
document.documentElement.className += " fonts-stage-2";
// Optimization for Repeat Views
sessionStorage.fontsLoadedCriticalFoftPreloadPolyfill = true;
});
});
})();
</script>
</head>
<body>
<h1>Critical FOFT with preload (polyfill)</h1>
<p>This is a paragraph. <strong>This is heavier text.</strong> <em>This is emphasized text.</em> <strong><em>This is
heavier and emphasized text.</em></strong></p>
<hr style="margin-top: 2em">
<ul>
<li>This demo is a companion to <a href="https://www.zachleat.com/web/comprehensive-webfonts/">A Comprehensive Guide
to Font Loading Strategies</a></li>
<li>See all demos on <a href="https://github.com/zachleat/web-font-loading-recipes">GitHub
<code>zachleat/web-font-loading-recipes</code></a></li>
</ul>
</body>
</html>