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<!DOCTYPE html>
<title>CSS Anchor Positioning: basic inset-area positioning</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position/#inset-area">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!-- The grid:
100 150 150
+--------+--------+--------+
| | | |
150 | | | |
| | | |
+--------+--------+--------+
| | | |
75 | | | |
| | | |
+--------+--------+--------+
| | | |
175 | | | |
| | | |
+--------+--------+--------+
-->
<style>
#container {
position: absolute;
width: 400px;
height: 400px;
}
#anchored {
position: absolute;
align-self: stretch;
justify-self: stretch;
position-anchor: --anchor;
}
#anchor {
margin-top: 150px;
margin-left: 100px;
width: 150px;
height: 75px;
anchor-name: --anchor;
}
</style>
<div id="container">
<div id="anchored"></div>
<div id="anchor"></div>
</div>
<script>
function test_inset_area(inset_area, expected_offsets) {
anchored.style.insetArea = inset_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: " + inset_area);
}
test_inset_area("none", {left:0, top:0, width:0, height:0});
test_inset_area("span-all", {left:0, top:0, width:400, height:400});
test_inset_area("span-all span-all", {left:0, top:0, width:400, height:400});
// Single region spans
test_inset_area("top left", {left:0, top:0, width:100, height:150});
test_inset_area("top center", {left:100, top:0, width:150, height:150});
test_inset_area("top right", {left:250, top:0, width:150, height:150});
test_inset_area("center left", {left:0, top:150, width:100, height:75});
test_inset_area("center center", {left:100, top:150, width:150, height:75});
test_inset_area("center right", {left:250, top:150, width:150, height:75});
test_inset_area("bottom left", {left:0, top:225, width:100, height:175});
test_inset_area("bottom center", {left:100, top:225, width:150, height:175});
test_inset_area("bottom right", {left:250, top:225, width:150, height:175});
test_inset_area("start start", {left:0, top:0, width:100, height:150});
test_inset_area("start center", {left:100, top:0, width:150, height:150});
test_inset_area("start end", {left:250, top:0, width:150, height:150});
test_inset_area("center start", {left:0, top:150, width:100, height:75});
test_inset_area("center end", {left:250, top:150, width:150, height:75});
test_inset_area("end start", {left:0, top:225, width:100, height:175});
test_inset_area("end center", {left:100, top:225, width:150, height:175});
test_inset_area("end end", {left:250, top:225, width:150, height:175});
test_inset_area("self-start self-start", {left:0, top:0, width:100, height:150});
test_inset_area("self-start center", {left:100, top:0, width:150, height:150});
test_inset_area("self-start self-end", {left:250, top:0, width:150, height:150});
test_inset_area("center self-start", {left:0, top:150, width:100, height:75});
test_inset_area("center self-end", {left:250, top:150, width:150, height:75});
test_inset_area("self-end self-start", {left:0, top:225, width:100, height:175});
test_inset_area("self-end center", {left:100, top:225, width:150, height:175});
test_inset_area("self-end self-end", {left:250, top:225, width:150, height:175});
test_inset_area("y-start x-start", {left:0, top:0, width:100, height:150});
test_inset_area("y-start center", {left:100, top:0, width:150, height:150});
test_inset_area("y-start x-end", {left:250, top:0, width:150, height:150});
test_inset_area("center x-start", {left:0, top:150, width:100, height:75});
test_inset_area("center x-end", {left:250, top:150, width:150, height:75});
test_inset_area("y-end x-start", {left:0, top:225, width:100, height:175});
test_inset_area("y-end center", {left:100, top:225, width:150, height:175});
test_inset_area("y-end x-end", {left:250, top:225, width:150, height:175});
test_inset_area("y-self-start x-self-start", {left:0, top:0, width:100, height:150});
test_inset_area("y-self-start center", {left:100, top:0, width:150, height:150});
test_inset_area("y-self-start x-self-end", {left:250, top:0, width:150, height:150});
test_inset_area("center x-self-start", {left:0, top:150, width:100, height:75});
test_inset_area("center x-self-end", {left:250, top:150, width:150, height:75});
test_inset_area("y-self-end x-self-start", {left:0, top:225, width:100, height:175});
test_inset_area("y-self-end center", {left:100, top:225, width:150, height:175});
test_inset_area("y-self-end x-self-end", {left:250, top:225, width:150, height:175});
// Multi-region spans
test_inset_area("span-y-self-start span-x-self-end", {left:100, top:0, width:300, height:225});
test_inset_area("span-bottom span-all", {left:0, top:150, width:400, height:250});
// No implicit anchor means the inset-area should not apply.
anchored.style.positionAnchor = "implicit";
test_inset_area("span-all top", {left:0, top:0, width:0, height:0});
</script>
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