undo-redo-after-mutation.html

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div contenteditable></div>

<script>

"use strict";

let editor = document.querySelector("div[contenteditable]");

let selection = document.getSelection();

test(function () {

  editor.innerHTML = "<i>will be removed</i> abc";

  selection.collapse(editor.lastChild, editor.lastChild.length);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "<i>will be removed</i> abc<br><br>",

                "<br> element should be inserted by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "<i>will be removed</i> abc",

                "<br> element should be removed by execCommand(\"undo\")");

  editor.firstChild.remove();

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, " abc<br><br>",

                "<br> element should be inserted by execCommand(\"redo\")");

}, "Redo for execCommand(\"insertLineBreak\") after removing prior sibling with DOM API after undoing");

test(function () {

  editor.innerHTML = "abc";

  selection.collapse(editor.firstChild, editor.firstChild.length);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "abc<br><br>",

                "<br> element should be inserted by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "abc",

                "<br> element should be removed by execCommand(\"undo\")");

  let i = document.createElement("i");

  i.textContent = " appended text";

  editor.appendChild(i);

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "abc<i> appended text</i><br><br>",

                "<br> element should be appended by execCommand(\"redo\") after the appended text");

}, "Redo for execCommand(\"insertLineBreak\") after appending new child with DOM API after undoing");

test(function () {

  editor.innerHTML = "abc";

  selection.collapse(editor.firstChild, editor.firstChild.length);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "abc<br><br>",

                "<br> element should be inserted by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "abc",

                "<br> element should be removed by execCommand(\"undo\")");

  let i = document.createElement("i");

  i.textContent = "inserted text ";

  editor.insertBefore(i, editor.firstChild);

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "<i>inserted text </i>abc<br><br>",

                "<br> element should be appended by execCommand(\"redo\") after the appended text");

}, "Redo for execCommand(\"insertLineBreak\") after inserting new child with DOM API after undoing");

test(function () {

  editor.innerHTML = "<b>will be removed</b><i>abc</i>";

  selection.collapse(editor.querySelector("b").firstChild, editor.querySelector("b").firstChild.length);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "<b>will be removed<br></b><i>abc</i>",

                "<br> element should be inserted into the <b> element by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "<b>will be removed</b><i>abc</i>",

                "<br> element should be removed by execCommand(\"undo\")");

  editor.querySelector("b").remove();

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "<i>abc</i>",

                "<br> element shouldn't be restored by execCommand(\"redo\") after removing the <b> element");

}, "Redo for execCommand(\"insertLineBreak\") after removing its container with DOM API after undoing");

test(function () {

  editor.innerHTML = "<b>abc</b><i>will be removed</i>";

  selection.collapse(editor.querySelector("b").firstChild, editor.querySelector("b").firstChild.length);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "<b>abc<br></b><i>will be removed</i>",

                "<br> element should be inserted into the <b> element by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "<b>abc</b><i>will be removed</i>",

                "<br> element should be removed by execCommand(\"undo\")");

  editor.querySelector("i").remove();

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "<b>abc<br></b>",

                "<br> element should be restored by execCommand(\"redo\") after removing the following <i> element");

}, "Redo for execCommand(\"insertLineBreak\") after removing <i> element following the container with DOM API after undoing");

// Not sure whether redoing in both of the following 2 cases should work as so.

test(function () {

  editor.innerHTML = "<b>will be removed</b><i>abc</i>";

  selection.collapse(editor, 1);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "<b>will be removed</b><br><i>abc</i>",

                "<br> element should be inserted between the <b> and <i> elements by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "<b>will be removed</b><i>abc</i>",

                "<br> element should be removed by execCommand(\"undo\")");

  editor.querySelector("b").remove();

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "<br><i>abc</i>",

                "<br> element should be restored by execCommand(\"redo\") after removing the preceding <b> element");

}, "Redo for execCommand(\"insertLineBreak\") between <b> and <i> after removing preceding <b> element with DOM API after undoing");

test(function () {

  editor.innerHTML = "<b>abc</b><i>will be removed</i>";

  selection.collapse(editor, 1);

  document.execCommand("insertLineBreak", false, "");

  assert_equals(editor.innerHTML, "<b>abc</b><br><i>will be removed</i>",

                "<br> element should be inserted between the <b> and <i> elements by execCommand(\"insertLineBreak\")");

  document.execCommand("undo", false, "");

  assert_equals(editor.innerHTML, "<b>abc</b><i>will be removed</i>",

                "<br> element should be removed by execCommand(\"undo\")");

  editor.querySelector("i").remove();

  document.execCommand("redo", false, "");

  assert_equals(editor.innerHTML, "<b>abc</b><br>",

                "<br> element should be restored by execCommand(\"redo\") after removing the following <i> element");

}, "Redo for execCommand(\"insertLineBreak\") between <b> and <i> after after removing following <i> element with DOM API after undoing");

</script>