editing/plaintext-only/plaintext-only-in-designMode.html

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<title>Delete editor in a shadow</title>
<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 src="../include/editor-test-utils.js"></script>
<script>
"use strict";

document.designMode = "on";

addEventListener("load", () => {
  const div = document.querySelector("div[contenteditable=plaintext-only]");
  const utils = new EditorTestUtils(div);
  test(() => {
    utils.setupEditingHost("[ABC]");
    document.execCommand("bold");
    assert_equals(div.outerHTML, `<div contenteditable="plaintext-only"><b>ABC</b></div>`);
  }, "contenteditable=plaintext-only in the design mode should not prevent the style edit");

  test(() => {
    utils.setupEditingHost("A[B]C");
    document.execCommand("insertHTML", false, "<b>b</b>");
    assert_equals(div.outerHTML, `<div contenteditable="plaintext-only">A<b>b</b>C</div>`);
  }, "contenteditable=plaintext-only in the design mode should not suppress style of inserting HTML");

  promise_test(async () => {
    utils.setupEditingHost("<p>A[]B</p>");
    await utils.sendEnterKey();
    assert_equals(div.outerHTML, `<div contenteditable="plaintext-only"><p>A</p><p>B</p></div>`);
  }, "contenteditable=plaintext-only in the design mode should not cause inserting line break at typing Enter");
}, {once: true});
</script>
</head>
<body>
  <div contenteditable="plaintext-only"></div>
</body>
</html>