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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
position: absolute;
margin: 0px;
}
#scroller {
width: 400px;
height: 350px;
overflow: scroll;
scroll-snap-type: both mandatory;
}
#space {
width: 1000px;
height: 1000px;
}
#target {
width: 200px;
height: 200px;
left: 300px;
top: 300px;
scroll-snap-align: end start;
}
</style>
<div id="scroller">
<div id="space"></div>
<div id="target"></div>
</div>
<script>
var scroller = document.getElementById("scroller");
var width = scroller.clientWidth;
var height = scroller.clientHeight;
[
["horizontal-tb", 300, 500 - height],
["vertical-lr", 500 - width, 300],
["vertical-rl", width - 700, 300]
].forEach(([writing_mode, left, top]) => {
test(() => {
scroller.style.writingMode = writing_mode;
if (writing_mode == "vertical-rl")
document.getElementById("target").style.left = (width - 700) + "px";
scroller.scrollTo(0, 0);
assert_equals(scroller.scrollLeft, left, "aligns correctly on x");
assert_equals(scroller.scrollTop, top, "aligns correctly on y");
}, "Snaps correctly for " + writing_mode +
" writing mode with 'inline' and 'block' alignments");
})
</script>
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