| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: off-screen focus</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 auto element remains non-skipped when elements in its subtree have focus."> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| body, html { |
| padding: 0; |
| margin: 0; |
| } |
| |
| .spacer { |
| height: 3000px; |
| background: lightblue; |
| } |
| #container { |
| background: lightgreen; |
| contain-intrinsic-size: 50px 100px; |
| content-visibility: auto; |
| } |
| #focusable { |
| width: 10px; |
| height: 10px; |
| } |
| </style> |
| |
| <div class=spacer></div> |
| <div id=container> |
| <div id=focusable tabindex=0></div> |
| </div> |
| <div class=spacer></div> |
| |
| <script> |
| async_test((t) => { |
| // Initially container should be 3000px offscreen with contained height 100px. |
| function step1() { |
| const r = container.getBoundingClientRect(); |
| t.step(() => { |
| assert_equals(r.y, 3000, "step1 offset"); |
| assert_equals(r.height, 100, "step1 height"); |
| }); |
| |
| focusable.focus(); |
| requestAnimationFrame(step2); |
| } |
| // After focusing the subtree, the container should be somewhere closer than |
| // 3000px (scrolled into view) and the height should be 10px, since it no |
| // longer has containment. |
| function step2() { |
| const r = container.getBoundingClientRect(); |
| t.step(() => { |
| assert_less_than(r.y, 3000, "step2 offset"); |
| assert_equals(r.height, 10, "step2 height"); |
| }); |
| document.scrollingElement.scrollTop = 0; |
| requestAnimationFrame(step3); |
| } |
| // After scrolling the document back to the top, the container should be back |
| // at 3000px but because its subtree is still focused, it should have height |
| // 10px. |
| function step3() { |
| const r = container.getBoundingClientRect(); |
| t.step(() => { |
| assert_equals(r.y, 3000, "step3 offset"); |
| assert_equals(r.height, 10, "step3 height"); |
| }); |
| requestAnimationFrame(step4); |
| } |
| // This is a repeat of step3, to ensure that this is a stable state. |
| function step4() { |
| const r = container.getBoundingClientRect(); |
| t.step(() => { |
| assert_equals(r.y, 3000, "step4 offset"); |
| assert_equals(r.height, 10, "step4 height"); |
| }); |
| focusable.blur(); |
| requestAnimationFrame(step5); |
| } |
| // After blurring the focused element, we should go back to the contained |
| // height of 100px. |
| function step5() { |
| const r = container.getBoundingClientRect(); |
| t.step(() => { |
| assert_equals(r.y, 3000, "step5 offset"); |
| assert_equals(r.height, 100, "step5 height"); |
| }); |
| t.done(); |
| } |
| step1(); |
| }); |
| </script> |
| </html> |
