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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: 350px;
height: 350px;
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: 100px;
height: 100px;
background-color: green;
display: inline-block;
position: relative;
}
.grid {
position: absolute;
width: 350px;
height: 350px;
}
.snap:focus {
background-color: blue;
}
</style>
<div class="scroller" id="scroller">
<div class="large-space"><div>
<div class="grid" id="grid">
<div id="box1" tabindex="1" class="snap box">Box 1</div>
<div id="box2" tabindex="1" class="snap box">Box 2</div>
<div id="box3" tabindex="1" class="snap box">Box 3</div>
<div id="box4" tabindex="1" class="snap box">Box 4</div>
<div id="box5" tabindex="1" class="snap box">Box 5</div>
<div id="box6" tabindex="1" class="snap box">Box 6</div>
<div id="box7" tabindex="1" class="snap box">Box 7</div>
<div id="box8" tabindex="1" class="snap box">Box 8</div>
<div id="box9" tabindex="1" class="snap box">Box 9</div>
</div>
</div>
<script>
window.onload = () => {
// This test sets up a 3x3 grid within scroller:
// -------------------------
// | Box 1 | Box 2 | Box 3 |
// ------------------------
// | Box 4 | Box 5 | Box 6 |
// -------------------------
// | Box 7 | Box 8 | Box 9 |
// -------------------------
const scroller = document.getElementById("scroller");
const boxes = document.querySelectorAll(".snap.box");
function box(n) {
return boxes[n - 1];
}
promise_test(async (t) => {
await waitForCompositorCommit();
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[box(1), box(2), box(3)],
/*axis=*/ "y",
/*expected_target_x=*/null,
/*expected_target_y=*/box(1));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[box(4), box(5), box(6)],
/*axis=*/ "y",
/*expected_target_x=*/null,
/*expected_target_y=*/box(4));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[box(7), box(8), box(9)],
/*axis=*/"y",
/*expected_target_x=*/null,
/*expected_target_y=*/box(7));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[box(1), box(4), box(7)],
/*aligned_elements_y=*/[],
/*axis=*/"x",
/*expected_target_x=*/box(1));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[box(2), box(5), box(8)],
/*aligned_elements_y=*/[],
/*axis=*/"x",
/*expected_target_x=*/box(2));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[box(3), box(6), box(9)],
/*aligned_elements_y=*/[],
/*axis=*/"x",
/*expected_target_x=*/box(3));
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[box(2), box(5), box(8)],
/*aligned_elements_y=*/[box(4), box(5), box(6)],
/*axis=*/"both",
/*expected_target_x=*/box(5),
/*expected_target_y=*/box(5));
}, "scroller prefers target aligned in both axes.");
promise_test(async (t) => {
const box7 = box(7), box8 = box(8), box9 = box(9);
const initial_box8_top = box8.offsetTop;
t.add_cleanup(() => {
box8.style.top = `${initial_box8_top}px`;
});
// Move box 8 below box7 and box9.
box8.style.top = `${2 * box8.offsetTop}px`;
// Snap to box8.
scroller.scrollTop = box8.offsetTop;
// Test that if box7 and box9 are also shifted to align with box7,
// box8 is still treated as the selected snap target despite box7 being
// aligned on both axes.
runLayoutSnapSeletionVerificationTest(t, scroller, [box7, box9],
box8, "y");
}, "scroller follows selected snap target after layout shift, " +
"regardless of common snap area.");
}
</script>
</body>
</html>
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