[css-pseudo] remove duplicate reftests (#31659)
diff --git a/css/css-pseudo/highlight-styling-003-ref.html b/css/css-pseudo/highlight-styling-003-ref.html
deleted file mode 100644
index 0ea90d7..0000000
--- a/css/css-pseudo/highlight-styling-003-ref.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<link rel="author" title="Delan Azabani" href="mailto:dazabani@igalia.com">
-<script src="support/selections.js"></script>
-<link rel="stylesheet" href="support/highlights.css">
-<style>
- main {
- font-size: 7em;
- margin: 0.5em;
- }
- main::selection {
- color: white;
- background-color: green;
- }
-</style>
-<p>Test passes if the text below is white on green.
-<main class="highlight_reftest">quick</main>
-<script>selectNodeContents(document.querySelector("main"));</script>
diff --git a/css/css-pseudo/highlight-styling-003.html b/css/css-pseudo/highlight-styling-003.html
deleted file mode 100644
index 803b440..0000000
--- a/css/css-pseudo/highlight-styling-003.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>CSS Pseudo-Elements Test: highlight styling: custom properties are applicable properties in highlight pseudos</title>
-<link rel="author" title="Delan Azabani" href="mailto:dazabani@igalia.com">
-<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-styling">
-<link rel="match" href="highlight-styling-003-ref.html">
-<meta name="assert" value="This test verifies that ::selection styles can set and reference custom properties.">
-<script src="support/selections.js"></script>
-<link rel="stylesheet" href="support/highlights.css">
-<style>
- main {
- font-size: 7em;
- margin: 0.5em;
- }
- main::selection {
- --x: green;
- color: white;
- background-color: var(--x);
- }
-</style>
-<p>Test passes if the text below is white on green.
-<main class="highlight_reftest">quick</main>
-<script>selectNodeContents(document.querySelector("main"));</script>
diff --git a/css/css-pseudo/highlight-styling-004-ref.html b/css/css-pseudo/highlight-styling-004-ref.html
deleted file mode 100644
index 0ea90d7..0000000
--- a/css/css-pseudo/highlight-styling-004-ref.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<link rel="author" title="Delan Azabani" href="mailto:dazabani@igalia.com">
-<script src="support/selections.js"></script>
-<link rel="stylesheet" href="support/highlights.css">
-<style>
- main {
- font-size: 7em;
- margin: 0.5em;
- }
- main::selection {
- color: white;
- background-color: green;
- }
-</style>
-<p>Test passes if the text below is white on green.
-<main class="highlight_reftest">quick</main>
-<script>selectNodeContents(document.querySelector("main"));</script>
diff --git a/css/css-pseudo/highlight-styling-004.html b/css/css-pseudo/highlight-styling-004.html
deleted file mode 100644
index 28d5bc0..0000000
--- a/css/css-pseudo/highlight-styling-004.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>CSS Pseudo-Elements Test: highlight styling: originating custom property values do not affect highlight pseudos</title>
-<link rel="author" title="Delan Azabani" href="mailto:dazabani@igalia.com">
-<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-styling">
-<link rel="match" href="highlight-styling-004-ref.html">
-<meta name="assert" value="This test verifies that custom property values set in originating elements do not participate in the substitution of those properties in ::selection styles.">
-<script src="support/selections.js"></script>
-<link rel="stylesheet" href="support/highlights.css">
-<style>
- main {
- font-size: 7em;
- margin: 0.5em;
- --x: red;
- }
- main::selection {
- color: white;
- background-color: var(--x, green);
- }
-</style>
-<p>Test passes if the text below is white on green.
-<main class="highlight_reftest">quick</main>
-<script>selectNodeContents(document.querySelector("main"));</script>
