1 files changed, 25 insertions, 0 deletions
diff --git a/testing/web-platform/tests/feature-policy/experimental-features/resources/vertical-scroll.js b/testing/web-platform/tests/feature-policy/experimental-features/resources/vertical-scroll.js
new file mode 100644
index 0000000000..88835cc602
--- /dev/null
+++ b/testing/web-platform/tests/feature-policy/experimental-features/resources/vertical-scroll.js
@@ -0,0 +1,25 @@
+function rectMaxY(rect) {
+  return rect.height + rect.y;
+}
+
+function rectMaxX(rect) {
+  return rect.width + rect.x;
+}
+
+function isEmptyRect(rect) {
+  return !rect.width || !rect.height;
+}
+
+// Returns true if the given rectangles intersect.
+function rects_intersect(rect1, rect2) {
+  if (isEmptyRect(rect1) || isEmptyRect(rect2))
+    return false;
+  return rect1.x < rectMaxX(rect2) &&
+         rect2.x < rectMaxX(rect1) &&
+         rect1.y < rectMaxY(rect2) &&
+         rect2.y < rectMaxY(rect1);
+}
+
+function rectToString(rect) {
+  return `Location: (${rect.x}, ${rect.y}) Size: (${rect.width}, ${rect.height})`;
+}