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<!DOCTYPE html>
<html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.scroller {
height: 200px;
width: 400px;
border: 1px solid black;
overflow: auto;
}
.header {
height: 100px;
position: sticky;
top: 0;
background: rgb(255, 0, 0, 0.3);
}
.header + * {
scroll-margin-top: 100px;
}
.spacer {
height: 130px;
}
</style>
<div class="scroller">
<div class="header">
This header may obscure content below it.
</div>
<button>Focus this button</button>
<div class="spacer"></div>
<button>Start on this button</button>
</div>
<script>
test(() => {
const scroller = document.querySelector('.scroller');
let buttons = document.querySelectorAll('button');
assert_greater_than(scroller.scrollHeight, scroller.clientHeight,
'scroller should have scrolling content');
// Focusing the second button should scroll down.
buttons[1].focus();
assert_equals(scroller.scrollTop, scroller.scrollHeight - scroller.clientHeight,
'scrolls to bottom of scroller');
// Focusing the first button should scroll up.
buttons[0].focus();
assert_equals(scroller.scrollTop, 0,
'scrolls to top of scroller');
}, "Focus should scroll button outside of scroll margin");
</script>
</html>
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