This is a testharness.js-based test.
[FAIL] execCommand(insertText, false, "XYZ") in <div contenteditable><p>ab[c</p><select><option>d]ef</option></select></div>: shouldn't modify in <option>
  assert_in_array: value "<div contenteditable><p>abXYZc</p><select><option>def</option></select></div>" not in array ["<div contenteditable><p>abc</p><select><option>def</option></select></div>", "<div contenteditable><p>abXYZ</p><select><option>def</option></select></div>", "<div contenteditable><p>abXYZ<select><option>def</option></select></p></div>"]
[FAIL] execCommand(insertText, false, "XYZ") in <div contenteditable><p>abc</p><select>{<option>def</option><option>ghi</option>}</select><p>jkl</p></div>: shouldn't delete <option>s nor <select>
  assert_in_array: value "<div contenteditable><p>abc</p><p>XYZjkl</p></div>" not in array ["<div contenteditable><p>abc</p><select><option>def</option><option>ghi</option></select><p>jkl</p></div>", "<div contenteditable><p>abc</p>XYZ<select><option>def</option><option>ghi</option></select><p>jkl</p></div>", "<div contenteditable><p>abc</p><select><option>def</option><option>ghi</option></select>XYZ<p>jkl</p></div>"]
[FAIL] execCommand(insertText, false, "XYZ") in <div contenteditable><p>ab[c</p><select multiple><option>d]ef</option></select></div>: shouldn't modify in <option>
  assert_in_array: value "<div contenteditable><p>abXYZc</p><select multiple><option>def</option></select></div>" not in array ["<div contenteditable><p>abc</p><select multiple><option>def</option></select></div>", "<div contenteditable><p>abXYZ</p><select multiple><option>def</option></select></div>", "<div contenteditable><p>abXYZ<select multiple><option>def</option></select></p></div>"]
[FAIL] execCommand(insertText, false, "XYZ") in <div contenteditable><p>abc</p><select multiple>{<option>def</option><option>ghi</option>}</select><p>jkl</p></div>: shouldn't delete <option>s nor <select multiple>
  assert_in_array: value "<div contenteditable><p>abc</p><p>XYZjkl</p></div>" not in array ["<div contenteditable><p>abc</p><select multiple><option>def</option><option>ghi</option></select><p>jkl</p></div>", "<div contenteditable><p>abc</p>XYZ<select multiple><option>def</option><option>ghi</option></select><p>jkl</p></div>", "<div contenteditable><p>abc</p><select multiple><option>def</option><option>ghi</option></select>XYZ<p>jkl</p></div>"]
Harness: the test ran to completion.