- [Changelog since v1.19.9](#changelog-since-v1199)
  - [Important Security Information](#important-security-information-1)
    - [CVE-2021-25735: Validating Admission Webhook does not observe some previous fields](#cve-2021-25735-validating-admission-webhook-does-not-observe-some-previous-fields)
  - [Changes by Kind](#changes-by-kind-6)
    - [API Change](#api-change-1)
    - [Feature](#feature-4)
    - [Bug or Regression](#bug-or-regression-5)

 bottom: 0;\n    left: 0;\n    z-index: 1;\n    // Just in case `pointer-events: none` is set on a parent\n    pointer-events: auto;\n    content: \"\";\n    // IE10 bugfix, see https://stackoverflow.com/questions/16947967/ie10-hover-pseudo-class-doesnt-work-without-background-color\n    background-color: rgba(0, 0, 0, 0);\n  }\n}\n","// stylelint-disable declaration-no-important\n\n//\n// Text\n//\n\n.text-monospace { font-family: $font-family-monospace !important; }\n\n// Alignment\n\n.text-justify...

 $num: divide($size, $columns);\n  margin-left: if($num == 0, 0, percentage($num));\n}\n\n// Row columns\n//\n// Specify on a parent element(e.g., .row) to force immediate children into NN\n// number of columns. Supports wrapping to new lines, but does not do a Masonry\n// style grid.\n@mixin row-cols($count) {\n  > * {\n    flex: 0 0 auto;\n    width: divide(100%, $count);\n  }\n}\n\n// Framework grid generation\n//\n// Used only by Bootstrap to generate the correct number of grid classes given\n//...

* ♻ Simplify internal RegEx in `fastapi/utils.py`. PR [#5057](https://github.com/tiangolo/fastapi/pull/5057) by [@pylounge](https://github.com/pylounge).
* 🔧 Fix Type hint of `auto_error` which does not need to be `Optional[bool]`. PR [#4933](https://github.com/tiangolo/fastapi/pull/4933) by [@DavidKimDY](https://github.com/DavidKimDY).