This is a testharness.js-based test.
[FAIL] Selection.modify("move", "left", "character") when "abc<span>d[]ef</span>"
  assert_equals: expected "[(#text \\"def\\", 0)]" but got "[(#text \\"abc\\", 3)]"
[FAIL] Selection.modify("move", "left", "character") when "<b>abc</b><i>d[]ef</i>"
  assert_equals: expected "[(#text \\"def\\", 0)]" but got "[(#text \\"abc\\", 3)]"
[FAIL] Selection.modify("move", "left", "character") when "abc<span> []def</span>"
  assert_equals: expected "[(#text \\" def\\", 0)]" but got "[(#text \\"abc\\", 3)]"
[FAIL] Selection.modify("move", "left", "character") when "abc<span>  []def</span>"
  assert_equals: expected "[(#text \\"  def\\", 0)]" but got "[(#text \\"abc\\", 3)]"
[FAIL] Selection.modify("move", "left", "character") when "<span>abc</span>  []def"
  assert_equals: expected "[(#text \\"  def\\", 0)]" but got "[(#text \\"abc\\", 3)]"
Harness: the test ran to completion.