CKEditor and reverse ol lists

[asbjorn]

I am trying to get the following to work in CKEditor (inline editor):

<ol reversed>

With no luck.

Other options, like the one below seems to work. But the reversed is stripped from the text.

<ol start="50">

Anyone tried reversed, and got some pointers?

[dragan]

Works here. After saving, it becomes 

<ol reversed="">

Perhaps ACF and / or HTML Purifier are removing this. Try to define "extra allowed content" in your field settings.

[asbjorn]

Perhaps it is ACF and / or HTML Purifier. They are both turned on.

I tried adding this, with no luck:

ol[reversed]