Use CSS3 "resize" property in post

Hello,

I’m new to WordPress. I’m working for a company who just launched this blog :
https://mcnextpost.com/

Problem is : I’m trying to write a post about the new CSS3 property “resize”, but I can’t use it in the post itself. ??

I’m trying through the HTML editor to put a paragraph like this :
<p style="resize:horizontal;width:400px;overflow:auto">Some text</p>

But when I preview the post, WordPress keeps removing the resize property (the other ones remain).

I already tried to deactivate the visual editor in my profile, with no avail. Do you know why and how I can circumvent this?

Also I was in need to use a <textarea> in my post, but I already found out in the codex that it’s being removed for security reasons.

Any help greatly appreciated.