# CommonMark testing started here!

**URL:** https://meta.discourse.org/t/commonmark-testing-started-here/65121
**Category:** Feature
**Created:** [June 26, 2017, 12:44pm UTC](https://meta.discourse.org/t/commonmark-testing-started-here/65121 "2017-06-26T12:44:40Z")
**Posts on this page:** 1
**Showing post:** 78

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### Author: ![dax](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/dax/32/244677_2.png) [@dax](https://meta.discourse.org/u/dax)
#### Post date: [July 8, 2017, 10:02am UTC](https://meta.discourse.org/t/commonmark-testing-started-here/65121/78 "2017-07-08T10:02:19Z")

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I see that headings have changed from `##heading` to `## heading` (with a space).  
What happens to the old topics that use `##heading` instead of `## heading` after the upgrade?

We have to do a remap as describe here [Replace a string in all posts](https://meta.discourse.org/t/replace-a-string-in-all-posts/48729) ?

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