| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: measure layout</title> |
| <link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> |
| <meta name="assert" content="content-visibility hidden element layout is correct"> |
| <meta name="assert" content="content-visibility hidden element's subtree layout is correct"> |
| |
| <style> |
| #container { |
| background: lightgreen; |
| contain: layout; |
| } |
| .hidden { |
| content-visibility: hidden; |
| } |
| #sizer { |
| width: 100px; |
| height: 100px; |
| } |
| .child { |
| width: 20px; |
| height: 20%; |
| background: cyan; |
| } |
| #spacer { |
| width: 150px; |
| height: 150px; |
| background: green; |
| } |
| </style> |
| |
| <div id="parent"></div> |
| <div id="spacer"></div> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <script> |
| async_test((t) => { |
| function createChild(id) { |
| const child = document.createElement("div"); |
| child.classList = "child"; |
| child.id = id; |
| return child; |
| } |
| |
| function measureForced() { |
| t.step(() => { |
| // Ensure children are laid out; this forces a layout if it wasn't done. |
| assert_equals(document.getElementById("0").offsetTop, 0, "0 forced"); |
| assert_equals(document.getElementById("1").offsetTop, 20, "1 forced"); |
| assert_equals(document.getElementById("2").offsetTop, 40, "2 forced"); |
| // Both parent should be 0 height, since it's hidden. Both parent and spacers |
| // should have 8 offsetTop. |
| assert_equals(document.getElementById("parent").offsetTop, 8, "parent forced"); |
| assert_equals(document.getElementById("spacer").offsetTop, 8, "spacer forced"); |
| }); |
| } |
| |
| function measureWhenVisible() { |
| t.step(() => { |
| // Ensure children are still laid out. |
| assert_equals(document.getElementById("0").offsetTop, 0, "0 when visible"); |
| assert_equals(document.getElementById("1").offsetTop, 20, "1 when visible"); |
| assert_equals(document.getElementById("2").offsetTop, 40, "2 when visible"); |
| // Now the parent should encompass a container, so spacer is pushed down. |
| assert_equals(document.getElementById("parent").offsetTop, 8, "parent when visible"); |
| assert_equals(document.getElementById("spacer").offsetTop, 108, "spacer when visible"); |
| }); |
| } |
| |
| function construct(container) { |
| const sizer = document.createElement("div"); |
| sizer.id = "sizer"; |
| container.appendChild(sizer); |
| sizer.appendChild(createChild("0")); |
| sizer.appendChild(createChild("1")); |
| sizer.appendChild(createChild("2")); |
| } |
| |
| async function runTest() { |
| const container = document.createElement("div"); |
| container.id = "container"; |
| |
| document.getElementById("parent").appendChild(container); |
| container.classList.add("hidden"); |
| requestAnimationFrame(() => { |
| construct(container); |
| measureForced(); |
| |
| container.classList.remove("hidden"); |
| requestAnimationFrame(() => requestAnimationFrame(() => { |
| measureWhenVisible(); |
| t.done(); |
| })); |
| }); |
| } |
| |
| window.onload = function() { |
| requestAnimationFrame(() => requestAnimationFrame(runTest)); |
| }; |
| }, "Measure Forced Layout"); |
| </script> |
| |
| </html> |
