chromium/third_party/blink/web_tests/external/wpt/scroll-to-text-fragment/drag-selection-over-target-text.html

<!DOCTYPE html>
<html>
<head>
    <title>Drag Selection over a text directive</title>
    <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-actions.js"></script>
    <script src="/resources/testdriver-vendor.js"></script>

</head>
<body>
<p>This is a sample text.</p>
<script>
async function rAF() {
    return new Promise((resolve) => {
        window.requestAnimationFrame(resolve);
    });
}

document.addEventListener('DOMContentLoaded', () => {

    const textElement = document.querySelector('p');

    const rect = textElement.getBoundingClientRect();
    const startX = rect.left + 5;
    const startY = rect.top + 5;
    const endX = rect.right - 5;
    const endY = rect.top + 5;

    promise_test(async t => {
        const hashChange = new Promise(r => window.addEventListener('hashchange', r, { once: true }));

        location.hash = ':~:text=This is a sample text';
        await hashChange;

        await new test_driver.Actions()
            .pointerMove(startX, startY, { origin: 'viewport' })
            .pointerDown({ button: 0 })
            .pointerMove(endX, endY, { origin: 'viewport' })
            .pointerUp({ button: 0 })
            .send();

        await rAF();

        const selection = window.getSelection().toString();
        assert_true(selection.endsWith("sample text."), "A Selection should be created.");
    }, "Test drag and drop selection over a text directive");
});
</script>
</body>
</html>