<!DOCTYPE html>
<html>
<body>
<p>This tests mouseenter and mouseleave event fires when capturing event listeners are only present on the slot element's parent.<br>
To manually test, move the mouse cursor into the box below and move it out.<br>
You should see mouseenter events on slotContainer, slot, and target in that order and mouseleave events in the reverse order.</p>
<div id="hostParent"><div id="host"><span id="target" style="border: solid 1px black; padding: 0.5rem;">content</span></div></div><pre id="log"></pre>
<script>

const host = document.getElementById('host');
const shadowRoot = host.attachShadow({mode: 'closed'});
shadowRoot.innerHTML = `
    <div id="slotContainer">
        <slot id="slot"></slot>
    </div>`;
const slot = shadowRoot.querySelector('slot');

const target = document.getElementById('target');
slot.parentNode.addEventListener('mouseenter', logEvent, true);
slot.parentNode.addEventListener('mouseleave', logEvent, true);

function log(text) {
    document.getElementById('log').textContent += text + '\n';
}

function logEvent(event) {
    log(`${event.type} on ${event.target.id}`);
}

function logPhase(phase) {
    log(`\n==${phase}==`);
}

if (!window.eventSender)
    document.write('This test requires eventSender');
else {
    testRunner.dumpAsText();
    const targetRect = target.getBoundingClientRect();
    const x = targetRect.x + 40;
    logPhase('Entering target');
    eventSender.mouseMoveTo(x, targetRect.top + 5);

    logPhase('Leaving target');
    eventSender.mouseMoveTo(x, targetRect.bottom + 5);
    
    host.parentNode.style.display = 'none';
}

</script>
</body>
</html>