<!DOCTYPE html>
<title>CSS Anchor Positioning: try-tactic (margin)</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#typedef-position-try-fallbacks-try-tactic">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@position-try --pf {
left:10px;
top:20px;
margin: 5px 15px 25px 35px;
}
#cb {
position: absolute;
width: 400px;
height: 400px;
border: 1px solid black;
}
#target {
position: absolute;
left: 99999px; /* force fallback */
width: 30px;
height: 40px;
background-color: skyblue;
}
</style>
<div id=cb>
<div id=target></div>
</div>
<script>
function test_try_tactic(try_tactic, expected_offsets) {
target.style.positionTryFallbacks = `--pf ${try_tactic}`;
test(() => {
assert_equals(target.offsetLeft, expected_offsets.left, 'offsetLeft');
assert_equals(target.offsetTop, expected_offsets.top, 'offsetTop');
assert_equals(target.offsetWidth, expected_offsets.width, 'offsetWidth');
assert_equals(target.offsetHeight, expected_offsets.height, 'offsetHeight');
}, target.style.positionTryFallbacks);
}
let w = 30;
let h = 40;
let cbw = 400;
let cbh = 400;
test_try_tactic('', {left:10+35, top:20+5, width:w, height:h});
test_try_tactic('flip-block', {left:10+35, top:cbh-h-20-5, width:w, height:h});
test_try_tactic('flip-inline', {left:cbw-w-10-35, top:20+5, width:w, height:h});
test_try_tactic('flip-block flip-inline', {left:cbw-w-10-35, top:cbh-h-20-5, width:w, height:h});
test_try_tactic('flip-start', {left:20+5, top:10+35, width:h, height:w});
test_try_tactic('flip-block flip-start', {left:cbh-h-20-5, top:10+35, width:h, height:w});
test_try_tactic('flip-inline flip-start', {left:20+5, top:cbw-w-10-35, width:h, height:w});
test_try_tactic('flip-block flip-inline flip-start', {left:cbh-h-20-5, top:cbw-w-10-35, width:h, height:w});
</script>
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