Title: additonal CSS class, again Last modified: April 18, 2020 --- # additonal CSS class, again * Resolved [rgfactory](https://wordpress.org/support/users/rgfactory/) * (@rgfactory) * [6 years, 1 month ago](https://wordpress.org/support/topic/additonal-css-class-again/) * Hi Thomas, * I have the [same problem](https://wordpress.org/support/topic/additional-css-class-2/)( I can’t reply to this resolved issue), if I add an additional css class to a Katex block, it breaks the block rendering in the post edition page. * Example : I add the class named “**rgf-test**” to the block, then after saving my post and reloading the page, I have the following message in the JS console: * ``` Block validation: Expected attribute "class" of value "wp-block-katex-display-block katex-eq", saw "wp-block-katex-display-block katex-eq rgf-test Block validation: Block validation failed for "katex/display-block" ``` * Wordpress => 5.4 katex plugin version => 2.0.2 theme => twenty-eleven => 3.4 * I hope you’re doing well. * Thank you very much. * RG Factory. * PS : you can push the fix in development version if it’s more convenient, I will test it, just tell me. - This topic was modified 6 years, 1 month ago by [rgfactory](https://wordpress.org/support/users/rgfactory/). - This topic was modified 6 years, 1 month ago by [rgfactory](https://wordpress.org/support/users/rgfactory/). - This topic was modified 6 years, 1 month ago by [rgfactory](https://wordpress.org/support/users/rgfactory/). Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Author [Tom Churchman](https://wordpress.org/support/users/beskhue/) * (@beskhue) * [6 years, 1 month ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12697530) * Hi RG Factory, * I’ve not been able to reproduce this issue. * Does this (also) occur when creating a completely new post? * Could you share the post’s code? In the editor, press the three vertical dots in the top right, and select “code editor”. * Thread Starter [rgfactory](https://wordpress.org/support/users/rgfactory/) * (@rgfactory) * [6 years, 1 month ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12700015) * Hi Thomas, * yes it happens when creating a completely new post. * This is the post’s code : * ```

this is a test

\overrightarrow{OB} \begin{cases} x = v_0.\cos(\alpha).t \\ y = -\dfrac{1}{2}.g.t^2 + v_0.\sin(\alpha).t + h \end{cases}
``` * Plugin Author [Tom Churchman](https://wordpress.org/support/users/beskhue/) * (@beskhue) * [6 years, 1 month ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12700150) * I unfortunately am still not able to reproduce this issue with the same versions of WordPress, this plugin, and the theme Twenty Eleven. The additional class is added as expected. * However, the code your shared is immediately changed by WordPress to: * ```

this is a test

\overrightarrow{OB} \begin{cases} x = v_0.\cos(\alpha).t \\ y = -\dfrac{1}{2}.g.t^2 + v_0.\sin(\alpha).t + h \end{cases}
``` * Note the addition of `{"className":"rgf-test"}`. Could you try whether this code does render inside the block editor? * Thread Starter [rgfactory](https://wordpress.org/support/users/rgfactory/) * (@rgfactory) * [6 years, 1 month ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12700569) * Thomas, * I tried your code with the className, but when I save the post the code is replaced by the one without the classname… * But I figured out what is the problem (kind of…) : the wordpress framework [Bedrock](https://roots.io/docs/bedrock/master/installation/#getting-started) * Yeah, I forgot to say this, I use the framework [Bedrock](https://roots.io/bedrock/). * So here is what I did : Fresh install **without Bedrock**, your plugin **works like a charm**, you are right. Fresh install **with Bedrock**, **this css custom class bug appear**s. * I am a new user of Bedrock, so it will be difficult for me to find the origin of the bug… * So for now I’am gonna use the classic WordPress, without Bedrock, it is not a problem at all. * What do I do ? I mark as resolved, or do you wanna try to fix this Bedrock bug? * Thank you again Thomas. * Plugin Author [Tom Churchman](https://wordpress.org/support/users/beskhue/) * (@beskhue) * [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12703883) * I was able to reproduce the issue on Bedrock. I am not sure why the issue occurs on Bedrock and not on a “normal” WordPress install. * Regardless, I believe I’ve fixed the issue. The fix is available in the development version: [https://wordpress.org/plugins/katex/advanced/](https://wordpress.org/plugins/katex/advanced/) * Please test it and let me know whether it works for you. * Thread Starter [rgfactory](https://wordpress.org/support/users/rgfactory/) * (@rgfactory) * [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12712517) * Hello Thomas, * I tried with the development version (2.0.3) but it does not work on a fresh install of bedrock. * The css custom class bug is still there. * Plugin Author [Tom Churchman](https://wordpress.org/support/users/beskhue/) * (@beskhue) * [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12713137) * Hi RG Factory, * I made a mistake with the previous development version. Could you download the new development version and try again? - This reply was modified 6 years ago by [Tom Churchman](https://wordpress.org/support/users/beskhue/). * Thread Starter [rgfactory](https://wordpress.org/support/users/rgfactory/) * (@rgfactory) * [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12713629) * It works ! * Thank you very much. * Did you figured out why this error only appeared in Bedrock ? * Plugin Author [Tom Churchman](https://wordpress.org/support/users/beskhue/) * (@beskhue) * [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12713892) * Thank you for the confirmation! * I have not found out why it broke specifically for Bedrock. Bedrock uses the exact same WordPress 5.4 code as a “normal” install, so it probably has something to do with the WordPress configuration. * I was able to ascertain the issue was caused by a Bedrock installation requiring` className` to be explicitly mentioned as an attribute on the KaTeX block, whereas in a “normal” install it was not required (and, I believed, that was how it was intended). * I’ve not been able to tell what the specific difference between Bedrock and a normal install is that made this issue crop up, though. Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘additonal CSS class, again’ is closed to new replies. * ![](https://ps.w.org/katex/assets/icon.svg?rev=1993573) * [KaTeX](https://wordpress.org/plugins/katex/) * [Frequently Asked Questions](https://wordpress.org/plugins/katex/#faq) * [Support Threads](https://wordpress.org/support/plugin/katex/) * [Active Topics](https://wordpress.org/support/plugin/katex/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/katex/unresolved/) * [Reviews](https://wordpress.org/support/plugin/katex/reviews/) * 9 replies * 2 participants * Last reply from: [Tom Churchman](https://wordpress.org/support/users/beskhue/) * Last activity: [6 years ago](https://wordpress.org/support/topic/additonal-css-class-again/#post-12713892) * Status: resolved