| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width"> |
| <title>Dynamic sticky position change doesn't break inner sticky positioned items</title> |
| <link rel="help" href="https://drafts.csswg.org/css-position-3/#sticky-position"> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1908242"> |
| <link rel="author" title="Emilio Cobos" href="mailto:emilio@crisal.io"> |
| <link rel="author" title="Mozilla" href="https://mozilla.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| body { |
| margin: 0; |
| display: flex; |
| } |
| |
| #content { |
| border: 10px dashed gray; |
| height: 600vh; |
| } |
| |
| #sidebar { |
| align-self: start; |
| background-color: white; |
| border: 10px dashed gray; |
| top: 0; |
| } |
| |
| #sidebar-header { |
| position: sticky; |
| top: 0; |
| background-color: rgba(255, 0, 0, .5); |
| } |
| |
| #sidebar-content { |
| padding: 5px; |
| height: 200vh; |
| } |
| </style> |
| <div id=content> |
| CONTENT |
| </div> |
| <div id=sidebar> |
| <div id=sidebar-header> |
| SIDEBAR TOP STICKY |
| </div> |
| <div id=sidebar-content> |
| SIDEBAR CONTENT |
| </div> |
| </div> |
| <script> |
| let sidebar = document.getElementById("sidebar"); |
| let sidebarHeader = document.getElementById("sidebar-header"); |
| test(function() { |
| // Make the header and sidebar stick. |
| window.scrollTo(0, 100); |
| assert_less_than(sidebar.getBoundingClientRect().top, 0, "Sidebar should not be stuck (yet)"); |
| assert_equals(sidebarHeader.getBoundingClientRect().top, 0, "Sidebar header should be stuck"); |
| sidebar.style.position = "sticky"; |
| assert_equals(sidebar.getBoundingClientRect().top, 0, "Sidebar should be stuck now"); |
| assert_equals(sidebarHeader.getBoundingClientRect().top, 10, "Sidebar header should be stuck under sidebar border"); |
| }); |
| </script> |
