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+<!DOCTYPE html>
+<html>
+ <head>
+ <link rel="help" href="https://drafts.csswg.org/css-scroll-snap"/>
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ <script src="/dom/events/scrolling/scroll_support.js"></script>
+ <script src="/resources/testdriver.js"></script>
+ <script src="/resources/testdriver-actions.js"></script>
+ <script src="/resources/testdriver-vendor.js"></script>
+ <script src="resources/common.js" ></script>
+ </head>
+ <body>
+ <style>
+ .scroller {
+ overflow: scroll;
+ width: 450px;
+ height: 450px;
+ border: solid 1px black;
+ scroll-snap-type: both mandatory;
+ position: relative;
+ resize: both;
+ }
+ .large-space {
+ height: 300vh;
+ width: 300vw;
+ position: absolute;
+ }
+ .snap {
+ scroll-snap-align: start;
+ }
+ .box {
+ width: 200px;
+ height: 200px;
+ background-color: green;
+ position: absolute;
+ }
+ .inner {
+ width: 50px;
+ height: 50px;
+ background-color: yellow;
+ }
+ #box2 {
+ top: 0px;
+ left: 100px;
+ }
+ #box3 {
+ top: 100px;
+ left: 0px;
+ }
+ </style>
+ <div class="scroller" id="scroller">
+ <div class="large-space"><div>
+ <div id="box1" class="snap box">Box 1</div>
+ <div id="box2" class="inner snap box">Box 2</div>
+ <div id="box3" class="inner snap box">Box 3</div>
+ </div>
+ <script>
+ window.onload = () => {
+ const scroller = document.getElementById("scroller");
+ const boxes = document.querySelectorAll(".snap.box");
+ function box(n) {
+ return boxes[n - 1];
+ }
+
+ promise_test(async (t) => {
+ await waitForCompositorCommit();
+
+ // Box 2 should be selected as the target in the y axis despite Box 1's
+ // being a common target in both axes because Box 2 is nested within
+ // Box 1.
+ await runScrollSnapSelectionVerificationTest(t, scroller,
+ /*aligned_elements_x=*/[],
+ /*aligned_elements_y=*/[box(1), box(2)],
+ /*axis=*/ "y",
+ /*expected_target_x=*/null,
+ /*expected_target_y=*/box(2));
+
+ // Box 3 should be selected as the target in the x axis despite Box 1's
+ // being a common target in both axes because Box 3 is nested within
+ // Box 1.
+ await runScrollSnapSelectionVerificationTest(t, scroller,
+ /*aligned_elements_x=*/[box(1), box(3)],
+ /*aligned_elements_y=*/[],
+ /*axis=*/"x",
+ /*expected_target_x=*/box(3));
+ }, "scroller prefers nested area over area aligned in both axes.");
+ }
+ </script>
+ </body>
+</html>