[mathml] Implement the <munder>, <mover>, <munderover> elements

Implement the <munder>, <mover>, <munderover> elements and add a layout
algorithm [1] covering all three elements. This patch does
not yet cover all details of the algorithm (accent, stretchy operators)
to keep the patch simple, however FIXMEs are added.

[1] https://mathml-refresh.github.io/mathml-core/#underscripts-and-overscripts-munder-mover-munderover

Bug: 6606
Change-Id: I8a20bb3105b733ef57413114aed0e6b536597c46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119538
Commit-Queue: Rob Buis <rbuis@igalia.com>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756225}
18 files changed
tree: fd8d0ad331c7bca21307fdb847dbb67483422bce
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .vpython
  9. .vpython3
  10. .yapfignore
  11. AUTHORS
  12. BUILD.gn
  13. CODE_OF_CONDUCT.md
  14. DEPS
  15. ENG_REVIEW_OWNERS
  16. LICENSE
  17. LICENSE.chromium_os
  18. OWNERS
  19. PRESUBMIT.py
  20. PRESUBMIT_test.py
  21. PRESUBMIT_test_mocks.py
  22. README.md
  23. WATCHLISTS
  24. android_webview/
  25. apps/
  26. ash/
  27. base/
  28. build/
  29. build_overrides/
  30. buildtools/
  31. cc/
  32. chrome/
  33. chromecast/
  34. chromeos/
  35. cloud_print/
  36. codereview.settings
  37. components/
  38. content/
  39. courgette/
  40. crypto/
  41. dbus/
  42. device/
  43. docs/
  44. extensions/
  45. fuchsia/
  46. gin/
  47. google_apis/
  48. google_update/
  49. gpu/
  50. headless/
  51. infra/
  52. ios/
  53. ipc/
  54. jingle/
  55. media/
  56. mojo/
  57. native_client_sdk/
  58. net/
  59. pdf/
  60. ppapi/
  61. printing/
  62. remoting/
  63. rlz/
  64. sandbox/
  65. services/
  66. skia/
  67. sql/
  68. storage/
  69. styleguide/
  70. testing/
  71. third_party/
  72. tools/
  73. ui/
  74. url/
  75. weblayer/
README.md

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