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+++ b/testing/web-platform/tests/css/css-transforms/preserve3d-overflow-percent.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Overflow with preserve-3d and percentage-transformed parent is computed using the right reference box</title>
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#transform-style-property">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1626840">
+<link rel="mismatch" href="/common/blank.html">
+<style>
+:root {
+ overflow: hidden;
+}
+body {
+ margin: 0;
+ font-size: 28px;
+}
+#map {
+ width: 100%;
+ height: 100%;
+ backface-visibility: hidden;
+}
+.floor {
+ width: 100%;
+ height: 100vh;
+}
+.skew {
+ height: 20em;
+ width: 20em;
+ position: relative;
+ left: 50%;
+ top: calc(50% + 1.5em);
+ transform-origin: 0% 0%;
+ transform: rotateX(45deg) rotateZ(-45deg) translateX(-50%) translateY(-50%);
+ transform-style: preserve-3d;
+}
+.cylinder {
+ position: absolute;
+ background-color: green;
+ transform-style: preserve-3d;
+ width: 7em;
+ height: 7em;
+ transform: translateZ(1em);
+}
+</style>
+<div id="map">
+ <div class="floor">
+ <div class="skew" style="width: 13em; height: 47em; left: calc(50% + 0em); top: calc(50% + 0.5em);">
+ <div class="cylinder" style="left: calc(1.5em + 0em); top: calc(38em + 0em);"></div>
+ </div>
+ </div>
+</div>