1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-contain/container-queries/canvas-as-container-004.html b/testing/web-platform/tests/css/css-contain/container-queries/canvas-as-container-004.html
new file mode 100644
index 0000000000..b23846382b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-contain/container-queries/canvas-as-container-004.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<title>CSS Container Queries Test: Absolute positioned canvas as size container for focusable child with display</title>
+<link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<style>
+  @supports (container-type: size) {
+    canvas:focus-within {
+      background-color: green;
+    }
+    canvas {
+      display: block;
+      position: absolute;
+      width: 100px;
+      height: 100px;
+      container-type: size;
+    }
+    #target { display: none; }
+    @container (width = 100px) {
+      #target { display: block; }
+    }
+  }
+</style>
+<p>Test passes if there is a filled green square.</p>
+<canvas>
+  <div id="target" tabIndex="1"></div>
+</canvas>
+<script>
+  requestAnimationFrame(()=> {
+    requestAnimationFrame(()=> {
+      target.focus();
+    });
+  });
+</script>