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+<!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>