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diff --git a/layout/reftests/w3c-css/submitted/flexbox/flexbox-writing-mode-015.html b/layout/reftests/w3c-css/submitted/flexbox/flexbox-writing-mode-015.html
deleted file mode 100644
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--- a/layout/reftests/w3c-css/submitted/flexbox/flexbox-writing-mode-015.html
+++ /dev/null
@@ -1,89 +0,0 @@
-<!DOCTYPE html>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html>
-<head>
-  <title>
-    CSS Test: Testing a mix of flex items with various values for
-    'writing-mode' / 'direction' in a vertical column-oriented flex container
-    with 'direction' flipped.
-  </title>
-  <meta charset="utf-8">
-  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
-  <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#flex-direction-property">
-  <link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#propdef-writing-mode">
-  <link rel="match" href="flexbox-writing-mode-015-ref.html">
-  <link rel="stylesheet" type="text/css" href="support/ahem.css">
-  <style>
-  .container {
-    display: flex;
-    flex-direction: column;
-    border: 2px solid purple;
-    padding: 2px;
-    margin-bottom: 2em;
-    height: 150px;
-    width: 500px;
-  }
-
-  span {
-    display: block;
-    background: lightgrey;
-    border: 2px solid black;
-    /* If browser supports it, signal the inline direction with border color: */
-    border-block-start-color: orange;
-    border-inline-start-color: lime;
-
-    margin: 11px 13px 17px 7px;
-    inline-size: 6px;
-  }
-
-  .small { font: 12px Ahem; }
-  .big   { font: 20px Ahem; }
-
-  .hl  { writing-mode: horizontal-tb;  direction: ltr; }
-  .hr  { writing-mode: horizontal-tb;  direction: rtl; }
-  .vl  { writing-mode: vertical-lr;    direction: ltr; }
-  .vr  { writing-mode: vertical-rl;    direction: ltr; }
-  .vl_rtl { writing-mode: vertical-lr; direction: rtl; }
-  .vr_rtl { writing-mode: vertical-rl; direction: rtl; }
-  </style>
-</head>
-<body>
-
-<div class="container vl_rtl">
-  <span class="hl small">a b c</span>
-  <span class="hl big">d e</span>
-  <span class="hr small">a b c</span>
-  <span class="hr big">d e</span>
-  <span class="vl small">a b c</span>
-  <span class="vl big">d e</span>
-</div>
-<div class="container vl_rtl">
-  <span class="vr small">a b c</span>
-  <span class="vr big">d e</span>
-  <span class="vl_rtl small">a b c</span>
-  <span class="vl_rtl big">d e</span>
-  <span class="vr_rtl small">a b c</span>
-  <span class="vr_rtl big">d e</span>
-</div>
-<div class="container vr_rtl">
-  <span class="hl small">a b c</span>
-  <span class="hl big">d e</span>
-  <span class="hr small">a b c</span>
-  <span class="hr big">d e</span>
-  <span class="vl small">a b c</span>
-  <span class="vl big">d e</span>
-</div>
-<div class="container vr_rtl">
-  <span class="vr small">a b c</span>
-  <span class="vr big">d e</span>
-  <span class="vl_rtl small">a b c</span>
-  <span class="vl_rtl big">d e</span>
-  <span class="vr_rtl small">a b c</span>
-  <span class="vr_rtl big">d e</span>
-</div>
-
-</body>
-</html>