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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>
.snap {
scroll-snap-align: start;
}
.placeholder {
height: 40%;
width: 40%;
position: absolute;
top: 0px;
border: solid 1px black;
}
.right {
left: 50%;
}
.container {
position: relative;
border: solid 1px blue;
overflow: scroll;
scroll-snap-type: y mandatory;
}
.bigcontainer {
height: 1000px;
width: 1000px;
}
.smallcontainer {
height: 400px;
width: 400px;
position: absolute;
border: solid 1px blue;
top: 500px;
overflow: scroll;
scroll-snap-type: y mandatory;
}
.large-space {
height: 300vh;
width: 300vw;
position: absolute;
}
.target {
top: 50%;
width: 40%;
height: 40%;
position: absolute;
border: solid 1px red;
}
.target:focus {
border:solid 2px green;
}
</style>
<div class="bigcontainer container" id="outercontainer">
<div class="large-space"></div>
<div id="leftplaceholder" class="snap placeholder">LPH (outer)</div>
<div id="rightplaceholder" class="snap placeholder right">RPH (outer)</div>
<div id="leftcontainer" class="snap smallcontainer">
<div class="large-space"></div>
<div class="snap placeholder"></div>
<div class="snap placeholder right"></div>
<div id="lefttarget1" tabindex="1" class="snap target"></div>
<div id="lefttarget2" tabindex="1" class="snap target right"></div>
</div>
<div id="rightcontainer" class="snap smallcontainer right">
<div class="large-space"></div>
<div class="snap placeholder"></div>
<div class="snap placeholder right"></div>
<div id="righttarget1" tabindex="1" class="snap target"></div>
<div id="righttarget2" tabindex="1" class="snap target right"></div>
</div>
</div>
<script>
// This test verifies that a snap container (outer) which contains another
// snap container (inner) snaps with awareness of focus on children of the
// inner container, i.e. outer should prefer to select the snap area whose
// child has focus even if there is an intermediate snap container between
// the child and outer.
window.onload = () => {
const lefttarget1 = document.getElementById("lefttarget1");
const righttarget1 = document.getElementById("righttarget1");
const leftcontainer = document.getElementById("leftcontainer");
const rightcontainer = document.getElementById("rightcontainer");
const outercontainer = document.getElementById("outercontainer");
promise_test(async (t) => {
await waitForCompositorCommit();
focusAndAssert(lefttarget1, /*preventScroll=*/true);
await runScrollSnapSelectionVerificationTest(t, outercontainer,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[leftcontainer, rightcontainer],
/*axis=*/"y",
/*expected_target_x=*/null,
/*expected_target_x=*/leftcontainer);
focusAndAssert(righttarget1, /*preventScroll=*/true);
await runScrollSnapSelectionVerificationTest(t, outercontainer,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[leftcontainer, rightcontainer],
/*axis=*/"y",
/*expected_target_x=*/null,
/*expected_target_x=*/rightcontainer);
}, "Snap container prefers focused nested snap target.");
}
</script>
</body>
</html>
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