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diff --git a/testing/web-platform/tests/css/css-flexbox/abspos/position-absolute-containing-block-001-ref.html b/testing/web-platform/tests/css/css-flexbox/abspos/position-absolute-containing-block-001-ref.html
new file mode 100644
index 0000000000..5f8bcaf539
--- /dev/null
+++ b/testing/web-platform/tests/css/css-flexbox/abspos/position-absolute-containing-block-001-ref.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>CSS Test Reference</title>
+<meta charset="utf-8">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<style>
+.parent {
+  position: fixed;
+  top: 0;
+  left: 0;
+  display: block;
+  width: 200px;
+  height: 200px;
+  background: yellow;
+}
+
+.child {
+  position: absolute;
+  left: 50px;
+  top: 50px;
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+</style>
+<div class="parent"><div class="child"></div></div>