| <!DOCTYPE html> |
| <title>CSS Positioned Layout Module Test: 'overlay' is transitioned in and out of 'auto'</title> |
| <link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay"> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/popover.html"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #transition-in, #transition-out { |
| /* Force display:block both popover open or closed to not rely on |
| @starting-style or display transitions. */ |
| display: block; |
| } |
| .enable-transitions :is(#transition-in, #transition-out) { |
| transition: overlay 60s step-end; |
| transition-behavior: allow-discrete; |
| } |
| </style> |
| <div id="container"> |
| <div id="transition-in" popover></div> |
| <div id="transition-out" popover></div> |
| </div> |
| <script> |
| let transition_in = document.querySelector("#transition-in"); |
| let transition_out = document.querySelector("#transition-out"); |
| |
| test(() => { |
| transition_out.showPopover(); |
| assert_equals(getComputedStyle(transition_in).overlay, "none"); |
| assert_equals(getComputedStyle(transition_out).overlay, "auto"); |
| }, "Open the popover to be closed and verify computed overlay for both popovers"); |
| |
| container.className = "enable-transitions"; |
| |
| test(() => { |
| assert_true(transition_out.matches(':popover-open')); |
| assert_false(transition_in.matches(':popover-open')); |
| transition_in.showPopover(); |
| assert_true(transition_in.matches(':popover-open')); |
| assert_false(transition_out.matches(':popover-open')); |
| assert_equals(getComputedStyle(transition_in).overlay, "none", |
| 'Transition in should be delayed'); |
| assert_equals(getComputedStyle(transition_out).overlay, "auto", |
| 'Transition out should be delayed'); |
| }, "Transition overlays"); |
| </script> |
