| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: accessibility with forced layout</title> |
| <link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org"> |
| <link rel="help" href="https://github.com/WICG/display-locking"> |
| <meta name="assert" content="content-visibility auto subtrees are exposed not exposed by layout-inducing functions"> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <div style="height:10000px;"> |
| spacer so that everything below will be offscreen (and won't get viewport-activated) |
| </div> |
| <div id="hidden" style="content-visibility: auto"> |
| foo |
| <div id="child" tabindex="0"> |
| bar |
| </div> |
| </div> |
| |
| <script> |
| function axElementById(id) { |
| return accessibilityController.accessibleElementById(id); |
| } |
| |
| async_test((t) => { |
| let axHidden = axElementById("hidden"); |
| // #hidden is locked, and thus is saved as an AXNodeObject instead of an AXLayoutObject, |
| // and has 3 child nodes: "foo" text, "<newline>" text, and #child node. |
| // Note that we have the separate <newline> text because it's an AXNodeObject and does |
| // not do whitespace collapsing (though this might change in the future). |
| t.step(() => { assert_equals(axHidden.childrenCount, 3, "Children count when locked"); }); |
| |
| // getBoundingClientRect forces layout to ensure we can get correct values. |
| // This, however, should not be exposing new information to accessibility. |
| // content-visibility: hidden means that the contents of the element are not |
| // exposed in any way, but respond to script layout information requests. See |
| // https://github.com/WICG/display-locking for more information. |
| child.getBoundingClientRect(); |
| // Wait a few frames. |
| requestAnimationFrame(() => { |
| requestAnimationFrame(() => { |
| axHidden = axElementById("hidden"); |
| // #hidden should still be locked with the same 3 child nodes. |
| t.step(() => { assert_equals(axHidden.childrenCount, 3, "Children count after layout"); }); |
| t.done(); |
| }); |
| }); |
| }, "Accessiblility with forced layout does not recreate subtree"); |
| </script> |
