| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>Tests that a popover can be anchored to an unrendered element.</title> |
| <link rel=author href="mailto:xiaochengh@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 id=popover popover anchor=anchor></div> |
| <div id=anchor></div> |
| |
| <style> |
| #anchor { |
| display: none; |
| } |
| [popover] { |
| background: lime; |
| padding: 0; |
| border: 0; |
| width: 100px; |
| height: 100px; |
| top: anchor(top, 100px); |
| left: anchor(left, 100px); |
| } |
| </style> |
| |
| <script> |
| test(() => { |
| popover.showPopover(); |
| assert_equals(popover.offsetLeft, 100); |
| assert_equals(popover.offsetTop, 100); |
| }); |
| </script> |
