dir attribute

[mapmeld]

Hi, I am starting to write a Japanese-language article for Qiita, about Arabic language. In GitHub and Qiita Markdown, Arabic looks like this:

مرحبا

Arabic is a right-to-left language, so I want it right-aligned / right edge of the page:

مرحبا

In GitHub Markdown, I can do it like this (dir is direction, rtl is right-to-left)

<div dir='rtl'>مرحبا</div>

In Qiita Markdown, I can't find any way to do this. Can you change sanitizer to keep dir tag and its value?