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+<!DOCTYPE html>
+<title>Initial custom property values in div::selection rule</title>
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-cascade">
+<link rel="match" href="highlight-cascade-004-ref.html">
+<meta name="assert" value="This test verifies that the initial value given in a custom property registration is respected, when the property is referenced in ::selection styles but no value is defined. The initial value is not the guaranteed-invalid value, so the fallback value in var() is not used.">
+<script src="../support/selections.js"></script>
+<style>
+ @property --bg {
+ syntax: "<color>";
+ inherits: false;
+ initial-value: green;
+ }
+ div::selection {
+ background-color: var(--bg, red);
+ }
+</style>
+<div>PASS if background-color is green when selected</div>
+<script>
+ selectNodeContents(document.querySelector("div"));
+</script>