<html lang="en">
<head>
<title>iOS 12 iframe + position: fixed + translate3d bug</title>
<meta charset="UTF-8">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi">
<style>
html, body {
height: 100%;
width: 100%;
margin: 0;
}
body {
height: 1500px;
}
iframe {
width: 100%;
}
</style>
</head>
<body>
<iframe src="iframe.html"></iframe>
</body>
</html>
<html lang="en">
<head>
<title>iOS 12 iframe + position: fixed + translate3d bug</title>
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi">
<style>
#app {
height: 800px;
width: 100%;
box-sizing: border-box;
font-size: 1rem;
}
#gallery {
position: fixed;
transform: translate3d(0, 0, 0);
}
.item {
width: 1025px;
height: 800px;
background: lime
}
</style>
</head>
<body>
<div id="app">
<div id="gallery">
<div class="item">
<ol>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
<li>Part of this div vanishes when scrolled up.</li>
</ol>
</div>
</div>
</div>
</body>
</html>