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diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/modal-dialog-display-contents.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/modal-dialog-display-contents.html
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+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/modal-dialog-display-contents.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<title>Test that display: contents; on modal dialog & ::backdrop acts like display: block</title>
+<meta charset="utf-8">
+<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
+<link rel="help" href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element">
+<link rel="match" href="modal-dialog-display-contents-ref.html">
+<p>Test passes if there is a green dialog</p>
+<p>Dialog is display:<span id="computed-value"></span></p>
+<p>Dialog::backdrop is display:<span id="computed-value-backdrop"></span></p>
+<dialog>Dialog Contents</dialog>
+<style>
+dialog {
+    display: contents;
+    background-color: green;
+}
+dialog::backdrop {
+    display: contents;
+}
+</style>
+<script>
+dialog = document.querySelector("dialog");
+dialog.showModal();
+document.getElementById("computed-value").textContent = getComputedStyle(dialog).display;
+document.getElementById("computed-value-backdrop").textContent = getComputedStyle(dialog, "::backdrop").display;
+</script>
+</html>