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diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html
new file mode 100644
index 0000000000..934b4ff595
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+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: grid'</title>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<link rel="match" href="summary-display-grid-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: grid' makes it a grid container.">
+<style>
+.grid-container {
+  display: grid;
+  grid-template-columns: 200px 10px 0.3fr 10px 0.7fr;
+  grid-template-rows: auto 20px auto;
+}
+
+.grid-element {
+  background-color: #444;
+  color: #fff;
+  padding: 20px;
+  font-size: 2em;
+}
+
+.element-a {
+  grid-column-start: 1;
+  grid-column-end: ;
+  grid-row-start: 1;
+  grid-row-end: 2;
+  background: #6F9;
+}
+
+.element-b {
+  grid-column-start: 3;
+  grid-column-end: 4;
+  grid-row-start: 1;
+  grid-row-end: 2;
+  background: #69F;
+}
+
+.element-c {
+  grid-column-start: 5;
+  grid-column-end: 6;
+  grid-row-start: 1;
+  grid-row-end: 2;
+  background: #F69;
+}
+
+.element-d {
+  grid-column-start: 1;
+  grid-column-end: 2;
+  grid-row-start: 3;
+  grid-row-end: 4;
+  background: #9F6;
+}
+
+.element-e {
+  grid-column-start: 3;
+  grid-column-end: 4;
+  grid-row-start: 3;
+  grid-row-end: 4;
+  background: #96F;
+}
+
+.element-f {
+  grid-column-start: 5;
+  grid-column-end: 6;
+  grid-row-start: 3;
+  grid-row-end: 4;
+  background: #F96;
+}
+</style>
+<summary class="grid-container">
+  <div class="grid-element element-a">A</div>
+  <div class="grid-element element-b">B</div>
+  <div class="grid-element element-c">C</div>
+  <div class="grid-element element-d">D</div>
+  <div class="grid-element element-e">E</div>
+  <div class="grid-element element-f">F</div>
+</summary>