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<!doctype html>
<title>CSS Test Reference.</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
* {
margin: 0;
padding: 0;
}
:root, #outer {
width: 100vw;
height: 100vh;
overflow: hidden;
}
#outer {
transform-origin: 0 0;
transform: scale(5);
}
#pad {
/* So that scaling by five it takes half of the viewport */
height: 10vh;
}
#filtered {
width: 100%;
height: 10vh;
background: green;
}
</style>
<div id="outer">
<div id="pad"></div>
<div id="filtered"></div>
</div>