<!DOCTYPE html> <title>Imperative Slot API: intial fallback should be correctly set up</title> <link rel="author" href="mailto:xiaochengh@chromium.org"> <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1292292"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <div> <div id="host1"></div> <div id="host2"></div> </div> <script> test(() => { const host = document.getElementById('host1'); const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'}); shadow.innerHTML = '<slot>fallback</slot>'; const slot = shadow.firstChild; assert_array_equals(slot.assignedNodes(), []); assert_greater_than(host.offsetHeight, 0, 'Fallback content should be rendered'); }, 'Unassigned imperative slot can render text node as the initial fallback'); test(() => { const host = document.getElementById('host2'); const shadow = host.attachShadow({mode: 'open', slotAssignment: 'manual'}); shadow.innerHTML = '<slot><span>fallback</span></slot>'; const slot = shadow.firstChild; assert_array_equals(slot.assignedNodes(), []); assert_greater_than(host.offsetHeight, 0, 'Fallback content should be rendered'); }, 'Unassigned imperative slot can render element as the initial fallback'); </script>