<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: accessibility focus</title>
<link rel="author" title="Rakina Zata Amni" href="mailto:[email protected]">
<link rel="help" href="https://github.com/WICG/display-locking">
<meta name="assert" content="content-visibility auto subtrees are exposed by accessibility focus">
<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"); });
// Focus to #child. This will cause the element to be brought into the view,
// since it is focusable even though it is locked by content-visibility (see
// https://github.com/WICG/display-locking for details). 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").takeFocus();
// Wait for the next frame for the ax object to be recreated.
requestAnimationFrame(() => {
requestAnimationFrame(() => {
let axHidden = axElementById("hidden");
// Now #target is not locked, expect 2 children (no whitespace node).
// This is the same as it would be if content-visibility had never been used.
t.step(() => { assert_equals(axHidden.childrenCount, 2, "Children count after activation"); });
t.done();
});
});
}, "Accessiblility focus causes activatable hidden tree to activate");
</script>
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