1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/backdrop-in-flow-ref.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/backdrop-in-flow-ref.html
new file mode 100644
index 0000000000..4857557bf8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/backdrop-in-flow-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<style>
+#backdrop {
+    position: absolute;
+    top: 100px;
+    left: 100px;
+    height: 100px;
+    width: 100px;
+    background: green;
+}
+</style>
+<body>
+Test that position 'static' or 'relative' for ::backdrop computes to 'absolute'.
+The test passes if there is a single green box.
+<div id="backdrop"></div>
+</body>