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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div>
<button id=b1>This is an anchor button</button>
<div popover id=p1 anchor=b1>This is a popover</div>
<button id=b2 popovertarget=p1>This button invokes the popover but isn't an anchor</button>
</div>
<script>
test(function() {
assert_equals(p1.anchorElement,b1);
}, "popover anchorElement IDL property returns the anchor element");
test(function() {
assert_equals(p1.anchorElement,b1);
p1.anchorElement = b2;
assert_equals(p1.anchorElement,b2);
assert_equals(p1.getAttribute('anchor'),'','Idref is empty after setting element');
p1.anchorElement = b1; // Reset
}, "popover anchorElement is settable");
</script>
<div>
<button id=b3>button</button>
<div id=p2>Anchored div</div>
</div>
<style>
* {margin:0;padding:0;}
#b3 {width: 200px;}
#p2 {
position: absolute;
left: anchor(right);
}
</style>
<script>
test(function() {
assert_equals(p2.anchorElement,null);
const button = document.getElementById('b3');
assert_true(!!button);
p2.anchorElement = button;
assert_equals(p2.getAttribute('anchor'),'','Idref should be empty after setting element');
assert_equals(p2.anchorElement,button,'Element reference should be button');
assert_equals(p2.offsetLeft, 200, 'The anchor relationship should be functional');
}, "anchorElement affects anchor positioning");
</script>
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