| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: containment added</title> |
| <link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> |
| <meta name="assert" content="content-visibility visible does not add containment"> |
| <meta name="assert" content="content-visibility hidden adds containment"> |
| <meta name="assert" content="content-visibility auto adds containment"> |
| <meta name="assert" content="content-visibility auto visibility switches after rAF callbacks of the frame that produces the painted output"> |
| |
| <style> |
| .auto { |
| content-visibility: auto; |
| } |
| .hidden { |
| content-visibility: hidden; |
| } |
| .spacer { |
| height: 10000px; |
| } |
| </style> |
| <div id="container"></div> |
| <div id="onscreen_container"></div> |
| <div class=spacer></div> |
| <div id="offscreen_container"></div> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <script> |
| function setUp(container) { |
| container.style = ""; |
| container.classList = ""; |
| assert_equals(getComputedStyle(container).contain, "none"); |
| } |
| |
| test(() => { |
| setUp(container); |
| container.classList.add("hidden"); |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| }, "content-visibility: hidden adds contain: size layout style;"); |
| |
| async_test((t) => { |
| setUp(onscreen_container); |
| setUp(offscreen_container); |
| |
| function runTest() { |
| onscreen_container.classList.add("auto"); |
| offscreen_container.classList.add("auto"); |
| |
| t.step(() => assert_equals(getComputedStyle(onscreen_container).contain, "size layout style paint", "initial onscreen")); |
| t.step(() => assert_equals(getComputedStyle(offscreen_container).contain, "size layout style paint", "initial offscreen")); |
| // Considering this as frame 1, at the end of the frame intersection observation will happen |
| // and determine that on-screen is visible and off-screen is not. The on-screen switch will |
| // happen synchronously since this is the first time we check, so for the remainder of the |
| // frames, on-screen should not have a size containment. |
| |
| // For off-screen container: |
| // At frame 2, we verify that it has size containment. |
| // At frame 3, we scroll it into view and verify it has size containment. At the end of the frame |
| // we will determine that it is visible and schedule a visibility switch to happen at the next |
| // frame (at post-rAF timing). |
| // At frame 4, we still have size containment until after rAF callbacks. |
| // At frame 5, the container is no longer size-contained since it is visible. |
| requestAnimationFrame(() => { |
| // Frame 2 checks: |
| t.step(() => assert_equals(getComputedStyle(onscreen_container).contain, "layout style paint", "frame 2 onscreen")); |
| t.step(() => assert_equals(getComputedStyle(offscreen_container).contain, "size layout style paint", "frame 2 offscreen")); |
| |
| requestAnimationFrame(() => { |
| window.scrollBy(0, 10000); |
| |
| // Frame 3 checks: |
| t.step(() => assert_equals(getComputedStyle(offscreen_container).contain, "size layout style paint", "frame 3")); |
| |
| requestAnimationFrame(() => { |
| // Frame 4 checks: |
| t.step(() => assert_equals(getComputedStyle(offscreen_container).contain, "size layout style paint", "frame 4")); |
| |
| requestAnimationFrame(() => { |
| // Frame 5 checks: |
| t.step(() => assert_equals(getComputedStyle(offscreen_container).contain, "layout style paint", "frame 5")); |
| t.done(); |
| }); |
| }); |
| }); |
| }); |
| } |
| // rAF to ensure we know where we are in the lifecycle. |
| requestAnimationFrame(runTest); |
| }, "content-visibility: auto adds contain: size layout style paint;"); |
| |
| test(() => { |
| setUp(container); |
| container.classList.add("auto"); |
| container.style = "contain: style;"; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| container.style = "contain: style layout;"; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| container.style = ""; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| }, "content-visibility: auto adds contain: size layout style paint, can't be overridden"); |
| |
| test(() => { |
| setUp(container); |
| container.classList.add("auto"); |
| container.style = "contain: paint;"; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| container.style = "contain: strict;"; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| container.style = "contain: content;"; |
| assert_equals(getComputedStyle(container).contain, "size layout style paint"); |
| }, "content-visibility keeps all containment even when shorthands are specified"); |
| </script> |
