1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/scroll-to-text-fragment/resources/util.js b/testing/web-platform/tests/scroll-to-text-fragment/resources/util.js
new file mode 100644
index 0000000000..00e1292988
--- /dev/null
+++ b/testing/web-platform/tests/scroll-to-text-fragment/resources/util.js
@@ -0,0 +1,21 @@
+// Returns true if element's center is within the visual viewport bounds.
+function isInViewport(element) {
+  const viewportRect = {
+    left: visualViewport.offsetLeft,
+    top: visualViewport.offsetTop,
+    right: visualViewport.offsetLeft + visualViewport.width,
+    bottom: visualViewport.offsetTop + visualViewport.height
+  };
+
+  const elementRect = element.getBoundingClientRect();
+  const elementCenter = {
+    x: elementRect.left + elementRect.width / 2,
+    y: elementRect.top + elementRect.height / 2
+  };
+
+  return elementCenter.x > viewportRect.left &&
+         elementCenter.x < viewportRect.right &&
+         elementCenter.y > viewportRect.top &&
+         elementCenter.y < viewportRect.bottom;
+}
+