1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-block-formatting-context.html b/testing/web-platform/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-block-formatting-context.html
new file mode 100644
index 0000000000..c38944ae79
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-block-formatting-context.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>The fieldset element: block formatting context</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<style>
+* {
+  margin: 0;
+  padding: 0;
+}
+fieldset { border: none; }
+.float {
+  float: left;
+  width: 50px;
+  height: 50px;
+  background-color: orange;
+}
+</style>
+
+<div class=float></div>
+<fieldset><div class=float></div></fieldset>
+
+<script>
+test(() => {
+  const fieldset = document.querySelector('fieldset');
+  assert_equals(fieldset.offsetTop, 0, 'fieldset.offsetTop');
+  assert_equals(fieldset.offsetLeft, 50, 'fieldset.offsetLeft');
+  assert_equals(fieldset.clientHeight, 50, 'fieldset.clientHeight');
+});
+</script>