<!DOCTYPE html>
<meta charset="utf-8" />
<title>Interaction of 'inert' attribute with modal dialog</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#inert">
<meta name="assert" content="Checks that a modal dialog escapes inertness from ancestors.">
<div id="log"></div>
<div id="wrapper">
  wrapper
  <dialog id="dialog">
    dialog
    <span id="child">
      child
    </span>
  </dialog>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup(() => {
  dialog.showModal();
  add_completion_callback(() => {
    dialog.close();
    getSelection().removeAllRanges();
  });
});

function checkSelection(expectedText) {
  const selection = getSelection();
  selection.selectAllChildren(document.documentElement);
  const actualText = selection.toString().trim();
  assert_equals(actualText, expectedText);
}

test(function() {
  checkSelection("dialog child");
}, "Modal dialog only marks outside nodes as inert");

test(function() {
  child.inert = true;
  this.add_cleanup(() => { child.inert = false; });
  checkSelection("dialog");
}, "Inner nodes with 'inert' attribute become inert anyways");

test(function() {
  dialog.inert = true;
  this.add_cleanup(() => { dialog.inert = false; });
  checkSelection("");
}, "If the modal dialog has the 'inert' attribute, everything becomes inert");

test(function() {
  wrapper.inert = true;
  this.add_cleanup(() => { wrapper.inert = false; });
  checkSelection("dialog child");
}, "If an ancestor of the dialog has the 'inert' attribute, the dialog escapes inertness");
</script>
