# Post HTML Element Class Being Removed

**URL:** <https://meta.discourse.org/t/post-html-element-class-being-removed/32644>\
**Category:** Product Support\
**Created:** [August 28, 2015, 1:00pm UTC](https://meta.discourse.org/t/post-html-element-class-being-removed/32644 "2015-08-28T13:00:57Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Mittineague](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/mittineague/32/114259_2.png) [@Mittineague](https://meta.discourse.org/u/Mittineague)\
**Post date:** [September 3, 2015, 5:35pm UTC](https://meta.discourse.org/t/post-html-element-class-being-removed/32644/9 "2015-09-03T17:35:06Z")

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> [@pnewelljr](#):
>
> would whitelisting those two work similarly?

AFAIK whitelisting is for post content and is not involved with what is put into Admin → Customize

I am unfamiliar with the Mermaid (Flowchart) Plugin but my guess would be is that if you are having problems it is more likely a “onebox” issue.

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