| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Content Visibility: accessibility scrollToMakeVisible()</title> |
| <link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org"> |
| <link rel="help" href="https://github.com/WICG/display-locking"> |
| <meta name="assert" content="content-visibility auto subtrees are exposed by accessibility scrollToMakeVisible"> |
| |
| <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> |
| <div class=spacer></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"); }); |
| |
| // Scroll the #child into view. When that is done, |
| // the element will become unlocked and AXNodeObjects will be replaced with |
| // AXLayoutObjects, causing <newline> to be collapsed, so we expect to see |
| // two children. |
| axElementById("child").scrollToMakeVisible(); |
| |
| // If this is frame 1, then during frame 2, we will determine that we're |
| // visible and issue notifications of viewport intersection. However, the |
| // visibility notification is delayed to frame 3 past the rAF callbacks. So, |
| // check the result in frame 4. |
| requestAnimationFrame(() => { // Frame 2. |
| requestAnimationFrame(() => { // Frame 3. |
| requestAnimationFrame(() => { // Frame 4. |
| axHidden = axElementById("hidden"); |
| t.step(() => { |
| assert_equals(axHidden.childrenCount, 2, "Child count after activation"); |
| }); |
| t.done(); |
| }); |
| }); |
| }); |
| }, "Accessiblility scrollToMakeVisible() causes activatable hidden tree to activate"); |
| |
| </script> |
