TYPO3 Core

In my installation (Firefox, Chromium, Safari) I can use "small" in the RTE, no matter if I:

• use ", classes: []"
• use ", classes: ['']"
• drop ", classes: []" alltogether

In all three cases though, a <small class=""> is emitted for me...

Can you provide some details, is maybe some other extension also changing YAML RTE configuration, or maybe affect it via JS?

Color me surprised:

• It works in Legacy mode for me in both main + v12.4 (i.e. GIT checkout)
• It does NOT work in TYPO3 v12.4 composer mode with a completely vanilla installation (no extensions at all)

Steps to reproduce:

• Create directory like "t3-vanilla"
• Have a simple composer.json [1]
• Create a ddev project ("ddev config" > pick some name, docroot "htdocs", project type "typo3"
• ddev composer install
• ddev restart
• ddev launch typo3/install.php -> perform installation
• open backend
• Create an empty dummy page
• Create a content element "Regular text"
• In the bodytext enter any random text, select the text, choose dropdown "Styles" from CKeditor instance, pick "small"
• No HTML layout will be applied

If you edit the file `./vendor/typo3/cms-rte-ckeditor/Configuration/RTE/Default.yaml` and change:

- { name: "Small", element: "small", classes: [] }

to:

- { name: "Small", element: "small", classes: [''] }

it will indeed work when reloading the browser. Removing ", classes: []" will break the dropdown.

Since "classes: ['']" works in both legacy mode and composer mode, I'd argue using that to unbreak composer mode would be fair.

[1] composer.json

{
  "name": "debug/t3v12-vanilly",
  "version": "1.0.0",
  "require": {
    "ext-mysqli": "*",
    "ext-pdo": "*",
    "ext-iconv": "*",
    "ext-json": "*",
    "ext-simplexml": "*",
    "ext-openssl": "*",

    "typo3/minimal": "^12.0",

    "typo3/cms-fluid-styled-content": "^12.3",
    "typo3/cms-info": "^12.3",
    "typo3/cms-recycler": "^12.3",
    "typo3/cms-reports": "^12.3",
    "typo3/cms-rte-ckeditor": "^12.3",
    "typo3/cms-scheduler": "^12.3",
    "typo3/cms-setup": "^12.3",
    "typo3/cms-tstemplate": "^12.3",
    "typo3/cms-belog": "^12.3",
    "typo3/cms-beuser": "^12.3",
    "typo3/cms-adminpanel": "^12.3",
    "typo3/cms-filemetadata": "^12.3",
    "typo3/cms-impexp": "^12.3",
    "typo3/cms-viewpage": "^12.3",
    "typo3/cms-lowlevel": "^12.3",
    "typo3/cms-redirects": "^12.3",
    "typo3/cms-seo": "^12.3",
    "typo3/cms-felogin": "^12.3",
    "typo3/cms-form": "^12.3" 
  },

  "extra": {
    "typo3/cms": {
      "cms-package-dir": "{$vendor-dir}/typo3/cms",
      "web-dir": "htdocs" 
    }
  },
  "config": {
    "allow-plugins": {
      "typo3/cms-composer-installers": true,
      "typo3/class-alias-loader": true
    }
  }
}

Patch set 1 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/84679