1 files changed, 44 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-scroll-snap/scroll-margin-visibility-check.html b/testing/web-platform/tests/css/css-scroll-snap/scroll-margin-visibility-check.html
new file mode 100644
index 0000000000..b41ccb36fd
--- /dev/null
+++ b/testing/web-platform/tests/css/css-scroll-snap/scroll-margin-visibility-check.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-padding">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1708303">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+body { margin: 0 }
+#scroller {
+  height: 500px;
+  width: 500px;
+  scrollbar-width: none;
+  overflow: scroll;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+  scroll-margin: 100px;
+  margin-left: 510px;
+}
+</style>
+
+<div id="scroller">
+  <div style="width: 450px; height: 450px;"></div>
+  <div tabindex="0" id="target"></div>
+  <div style="width: 2000px; height: 2000px;"></div>
+</div>
+
+<script>
+let scroller = document.getElementById("scroller");
+let target = document.getElementById("target");
+promise_test(async function() {
+  scroller.scrollTo(0, 0);
+  await new Promise(resolve => {
+      scroller.addEventListener("scroll", resolve, { once: true });
+      document.getElementById("target").focus();
+  });
+  assert_true(scroller.scrollTop > 0, "Visibility check should not account for margin");
+  assert_true(scroller.scrollLeft > 0, "Visibility check should not account for margin");
+});
+</script>