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+<!DOCTYPE html>
+<title>CSS Cascade Layers: 'revert-layer' to host context</title>
+<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-layer">
+<link rel="match" href="reference/ref-filled-green-100px-square.xht">
+
+<style>
+#target {
+ width: 100px;
+ height: 100px;
+ background-color: revert-layer;
+}
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="target"></div>
+
+<script>
+target.attachShadow({mode: 'open'}).innerHTML = `
+<style>
+@layer first {
+ :host { background-color: green; }
+}
+@layer second {
+ :host { background-color: revert-layer; }
+}
+</style>
+`;
+</script>