gecko-dev/toolkit/components/pictureinpicture/tests/test-transparent-nested-ifr...

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HTML

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Picture-in-Picture test - transparent iframe</title>
</head>
<style>
video {
display: block;
}
.root {
position: relative;
display: inline-block;
}
.controls {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
color: white;
}
.container,
iframe {
width: 100%;
height: 100%;
}
iframe {
border: 0;
}
</style>
<body>
<div class="root">
<div class="controls">
<div class="container">
<iframe src="about:blank"></iframe>
</div>
</div>
<div class="video-container">
<video id="video-transparent-background" src="test-video.mp4" loop="true"></video>
</div>
</div>
</body>
</html>