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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/modal-dialog-selection.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Content selection in modal dialog</title>
<link rel="author" title="Oriol Brufau" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-ui-4/#content-selection">
<meta name="assert" content="Checks that text can be selected in a modal dialog, except with 'user-select: none'.">

<link rel="stylesheet" href="/fonts/ahem.css">
<style>
dialog {
  font: 10px/1 Ahem;
  text-align: center;
}
</style>

<dialog>123456789A</dialog>

<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>
<script src="/resources/testdriver-actions.js"></script>
<script>
const dialog = document.querySelector("dialog");
dialog.showModal();

function selectSomeText() {
  // Clear existing selection.
  getSelection().removeAllRanges();

  // The dialog contains 10 characters. Select the 6 ones at the center.
  return new test_driver.Actions()
    .pointerMove(-3e1, 0, {origin: dialog})
    .pointerDown()
    .pointerMove(+3e1, 0, {origin: dialog})
    .pointerUp()
    .send();
}

function clickOnBackdrop() {
  getSelection().removeAllRanges();

  return new test_driver.Actions()
    .pointerMove(10, 10)
    .pointerDown()
    .pointerUp()
    .send();
}

promise_test(async function() {
  await selectSomeText();
  assert_equals(getSelection().toString(), "345678");
}, "By default, text inside a modal dialog can be selected");

promise_test(async function() {
  await clickOnBackdrop();
  assert_equals(getSelection().toString(), "");
}, "Clicking on backdrop doesn't select text");

promise_test(async function() {
  dialog.style.userSelect = "none";

  await selectSomeText();
  assert_equals(getSelection().toString(), "");

  dialog.style.userSelect = "";
}, "'user-select: none' prevents text from being selected");
</script>