<!DOCTYPE html>
<title>CSS Anchor Positioning: position-area positioning with additional insets</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>
<!-- 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_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-all", {top:"5px", bottom:"5px", left:"5px", right:"5px"},
{left:5, top:5, width:390, height:390});
test_position_area("center center", {top:"10px", bottom:"40px", left:"5px", right:"15px"},
{left:105, top:160, width:130, height:25});
test_position_area("left bottom", {top:"10px", bottom:"40px", left:"5px", right:"15px"},
{left:5, top:235, width:80, height:125});
test_position_area("span-right center", {top:"20%", bottom:"auto", left:"auto", right:"25%"},
{left:100, top:165, width:225, height:60});
// No implicit anchor means the position-area should not apply, but the insets still should.
anchored.style.positionAnchor = "auto";
test_position_area("bottom right", {left:"50px", right:"100px", top:"30px" , bottom:"10px"},
{left:50, top:30, width:250, height:360});
</script>
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