It optimizes the size of the builds as the styles of unused features are simply excluded. These are by default included in the JavaScript build and loaded by the style loader. There is no such thing as the contents.css file anymore because in CKEditor 5 the features bring their own content styles. # What happened to the contents.css file? How do I style the content of the editor? You may also use the General HTML support feature in certain cases. Once you do that and load these plugins into you editor instance, CKEditor 5 will no longer filter anything out. If you want all the HTML5 elements to be supported, you need to write plugins to support them. If you load some content that is not recognizable to any of the editor features, it will be dropped. The feature defines the two–way conversion between the HTML (view) and the editor model. along with their representation in the model. For instance the ckeditor5-basic-styles package handles HTML elements such as, ,, etc. This means that every piece of content that is loaded into the editor needs to be converted to that model and then rendered back to the view.Įach kind of content must be handled by some feature. Unlike CKEditor 4, CKEditor 5 implements a custom data model. # Migration from CKEditor 4 - FAQ # Why does the editor filter out my content (styles, classes, elements)? Where is config.allowedContent = true? The General HTML Support feature may be used to introduce HTML markup that is present in the legacy content but is not yet fully covered by CKEditor 5 features.Ī relatively simple yet efficient strategy of adopting CKEditor 5 into existing systems might be using CKEditor 5 for creating new content and the old editor for editing legacy content. If necessary, you will need to develop conversion procedures to avoid data loss. # Existing dataĪn extremely important aspect to be remembered is that - because of the difference in features - the data produced with CKEditor 4 may not be compatible with CKEditor 5 (which may lead to data loss).Įxtensive analysis, data verification and tests should be performed on existing data. Fortunately, custom theming in CKEditor 5 is much more powerful and simpler than before. If you have custom skins for CKEditor 4, these skins need to be recreated for CKEditor 5. In CKEditor 5, the previous concept of “skins” was reviewed and is now called “themes”. When it comes to official plugins compatibility between CKEditor 4 and CKEditor 5, please see the compatibility table to learn more. The same may apply for third-party plugins which may not have been ported to CKEditor 5 yet.Ĭheck the Creating plugins section for more information on the development of plugins. Although their concept may stay the same, their implementation will certainly be different and will require rewriting them from scratch. The trickiest migration challenge to be faced may be related to custom plugins you have developed for CKEditor 4. Check out the comprehensive “Image upload” guide to find out the best option for your project. # Image uploadĬKEditor 5 supports several different image upload strategies. You should take this chance to rethink the features available in your application and perhaps switch the approach towards a more modern reasoning. There are thus good reasons for it to not support some old features. Therefore, it is worth spending some time analyzing required features.ĬKEditor 5 was designed with focus on creating quality content. Existing features may behave differently.CKEditor 5 may still not have the same features available as CKEditor 4.When it comes to features, there are two aspects that need to be taken into consideration: It is worth checking Basic API for an introduction. The API for integrating CKEditor with your pages also changed. It became much more modern with the introduction of modular patterns, UMD, npm, etc. The very first aspect that changed with CKEditor 5 is its installation procedure. Refer to the When NOT to use predefined CKEditor 5 builds? guide for more information. In this guide we hope to summarize the most important aspects you need to consider before you proceed with installing CKEditor 5.īefore starting, be sure that migrating is your best choice. There is no “drop in” solution for migrating. It is something bigger, so the “migration” term fits better. Therefore, moving applications using a previous CKEditor version to version 5 cannot be simply called an “upgrade”. Every single aspect of it was redesigned - from installation, to integration, to features, to its data model, and finally to its API. When compared to its predecessor, CKEditor 5 should be considered a totally new editor. This guide assumes that you know a bit about CKEditor 5, so if you are completely new to CKEditor 5, check the previous articles! In previous tutorials you have learned about installing, configuring and extending your editor.
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