LayoutTests/fast/events/drag-and-drop-link-containing-block.html

<style>
a {
    font-size: 100px;
    width: 100%;
    white-space: nowrap;
    font-family: -apple-system;
}

#drop {
    position: absolute;
    top: 300px;
    left: 0;
    width: 100%;
    height: 200px;
    border: 1px blue dashed;
}
</style>
<a id="drag" href="https://www.apple.com"><h1>Try to drag me</h1></a>
<div id="drop"><br></div>
<script>
(() => {
    drag.addEventListener("dragstart", event => {
        drop.insertAdjacentHTML("beforeend", `<code style="color: green">PASS (drag started)</code><br>`);
    });
    drop.addEventListener("dragenter", event => event.preventDefault());
    drop.addEventListener("dragover", event => event.preventDefault());
    drop.addEventListener("drop", event => {
        drop.insertAdjacentHTML("beforeend", `<code style="color: green">PASS (dropped)</code><br>`);
        event.preventDefault();
        if (window.testRunner)
            testRunner.notifyDone();
    });

    if (!window.testRunner || !window.eventSender)
        return;

    testRunner.waitUntilDone();
    testRunner.dumpAsText();
    eventSender.mouseMoveTo(100, 80);
    eventSender.mouseDown();
    eventSender.leapForward(100);
    eventSender.mouseMoveTo(100, 400);
    eventSender.mouseUp();
})();
</script>