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YAML (Yet Another Multicolumn Layout) is a cross-browser CSS framework. It allows web designers to create a low-barrier website with comparatively little effort. Integrations of the YAML layouts have been created for various content management systems. These include WordPress, LifeType, TYPO3, Joomla, xt: Commerce and Drupal.
As of YAML version 2.2, the framework is distributed under the Creative Commons Attribution 2.0 License (CC-BY 2.0). As an alternative for commercial use of the framework, there are two paid subscription models.
Video YAML (framework)
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Source of the article : Wikipedia