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Test Info:

<!DOCTYPE html>
<title>Scroll snap on Element.focus()</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
position: absolute;
margin: 0;
}
#scroller {
height: 500px;
width: 500px;
overflow-y: scroll;
scroll-snap-type: y mandatory;
}
.snap {
width: 100%;
height: 300px;
top: 100px;
left: 0;
background-color: green;
scroll-snap-align: start none;
}
.no-snap {
width: 100%;
height: 300px;
top: 100px;
left: 0;
background-color: red;
}
.area {
width: 100%;
height: 2000px;
}
</style>
<div id="scroller">
<div class="area"></div>
<div class="snap" style="top: 0px;"></div>
<div class="no-snap" style="top: 1000px;" tabindex=-1></div>
<div class="snap" style="top: 1200px;"></div>
</div>
<script>
promise_test(async () => {
document.querySelector(".no-snap").focus();
await new Promise(resolve => step_timeout(resolve, 0));
assert_equals(scroller.scrollTop, 1200);
}, "scroll snap should happens on Element.focus()");
</script>