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Test Info: Warnings

<!DOCTYPE html>
<html>
<meta charset=utf-8 />
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<body>
<div id='container'>
<custom-button id='custom_button'></custom-button>
</div>
<script>
promise_test(t => {
assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
let innerButtonClicked = false;
customElements.define('custom-button', class extends HTMLElement {
connectedCallback() {
this.attachShadow({mode: 'open'});
this.shadowRoot.innerHTML = `<button id='inner_button_id'>Click me</button>`;
this.shadowRoot.getElementById('inner_button_id').onmousedown = () => {
innerButtonClicked = true;
};
}
});
const observerPromise = new Promise(resolve => {
new PerformanceObserver(t.step_func(entryList => {
// There must only be one first-input entry.
assert_equals(entryList.getEntries().length, 1);
// entry.target must be the shadow host due to retargetting.
assert_equals(entryList.getEntries()[0].target,
document.getElementById('custom_button'));
assert_true(innerButtonClicked, 'Did not reach the shadow DOM event listener!');
resolve();
})).observe({entryTypes: ['first-input']});
});
const clickPromise = test_driver.click(document.getElementById('custom_button'));
return Promise.all([observerPromise, clickPromise]);
}, "Event Timing: test first input on shadow DOM.");
</script>
</body>
</html>