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<!DOCTYPE html>
<title>CSS Anchor Positioning: position-area positioning - anchor partially outside containing block</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position/#position-area">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container {
position: relative;
width: 400px;
height: 400px;
margin: 100px auto;
border: 2px solid;
background: #eee;
}
#anchor {
position: absolute;
right: -50px;
top: -50px;
width: 100px;
height: 100px;
anchor-name: --anchor;
background: blue;
}
#anchored {
position: absolute;
align-self: stretch;
justify-self: stretch;
position-anchor: --anchor;
background: #FA08;
outline: 1px solid orange;
}
</style>
<div id="container">
<div id="anchor"></div>
<div id="anchored"></div>
</div>
<script>
function test_position_area(position_area, expected_offsets) {
anchored.style.positionArea = position_area;
test(() => {
assert_equals(anchored.offsetLeft, expected_offsets.left, "Check expected offsetLeft");
assert_equals(anchored.offsetTop, expected_offsets.top, "Check expected offsetTop");
assert_equals(anchored.offsetWidth, expected_offsets.width, "Check expected offsetWidth");
assert_equals(anchored.offsetHeight, expected_offsets.height, "Check expected offsetHeight");
}, "Offsets for position-area: " + position_area);
}
test_position_area("span-all", {left:0, top:-50, width:450, height:450});
test_position_area("left span-all", {left:0, top:-50, width:350, height:450});
test_position_area("span-left span-all", {left:0, top:-50, width:450, height:450});
test_position_area("span-all center", {left:350, top:-50, width:100, height:450});
test_position_area("span-right span-all", {left:350, top:-50, width:100, height:450});
test_position_area("right span-all", {left:450, top:-50, width:0, height:450});
test_position_area("top span-all", {left:0, top:-50, width:450, height:0});
test_position_area("span-top span-all", {left:0, top:-50, width:450, height:100});
test_position_area("center span-all", {left:0, top:-50, width:450, height:100});
test_position_area("span-bottom span-all", {left:0, top:-50, width:450, height:450});
test_position_area("bottom span-all", {left:0, top:50, width:450, height:350});
</script>
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