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<!DOCTYPE html>
<title>CSS Anchor Positioning: position-area positioning inside grid</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>
<!--
Grid:
100 100 100 100
+--------+--------+--------+--------+
| | | | |
100 | | | | |
| | | | |
+--------+--------+--------+--------+
| | |XXXXXXXX|XXXXXXXX|
100 | | |XXXXXXXX|XXXXXXXX|
| | |XXXXXXXX|XXXXXXXX|
+--------+--------+--------+--------+
| | |XXXXXXXX|XXXXXXXX|
100 | | |XXXXXXXX|XXXXXXXX|
| | |XXXXXXXX|XXXXXXXX|
+--------+--------+--------+--------+
| | | | |
100 | | | | |
| | | | |
+--------+--------+--------+--------+
Inset regions:
100 150 150
+--------+-------------+------------+
| | | |
| | | |
150 | | | |
| | | |
| | | |
+--------+-------------+------------+
| | | |
75 | | | |
| | | |
+--------+-------------+------------+
| | | |
| | | |
175 | | | |
| | | |
| | | |
+--------+-------------+------------+
-->
<style>
#container {
display: grid;
grid: 1fr 1fr 1fr 1fr / 1fr 1fr 1fr 1fr;
position: relative;
width: 400px;
height: 400px;
outline: 1px solid;
}
#anchor {
position: absolute;
left: 100px;
top: 150px;
width: 150px;
height: 75px;
anchor-name: --anchor;
background: blue;
}
#anchored {
grid-row-start: 2;
grid-row-end: span 2;
grid-column-start: 3;
grid-column-end: auto;
position: absolute;
align-self: stretch;
justify-self: stretch;
position-anchor: --anchor;
border: solid orange;
}
</style>
<div id="container">
<div id="anchor"></div>
<div id="anchored"></div>
</div>
<script>
function test_position_area(position_area, insets, expected_offsets) {
anchored.style.positionArea = position_area;
for (const [prop, value] of Object.entries(insets)) {
anchored.style[prop] = value;
}
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 + " and insets: " + JSON.stringify(insets));
}
test_position_area("span-bottom span-left", {left:"auto", right:"auto", top:"auto", bottom:"auto"},
{left:100, top:150, width:150, height:150});
test_position_area("span-bottom span-left", {left:"10px", right:"10px", top:"10px", bottom:"10px"},
{left:110, top:160, width:130, height:130});
</script>
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