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Test Info:

<html class="test-wait">
h1::before { content: " [before] "; display: table; }
// Bypass this abandoned syntax in all but the engines that implement it.
if (typeof getComputedAccessibleNode !== 'undefined') {
async function trigger1() {
let heading = document.querySelector('h1');
let computed_accessible_node = await self.getComputedAccessibleNode(heading);
let first_child = computed_accessible_node.firstChild;
// The first child of the heading is a pseudo element <table>.
await first_child.ensureUpToDate();
// The next child down has an accessibility object but no node.
let grand_child = first_child.firstChild;
await grand_child.ensureUpToDate();
document.documentElement.className = '';
} else {
// Pass in other engines that have not implemented the abandoned API
document.documentElement.className = '';