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Trello accepts Markdown in card descriptions and it even helpfully links to the Markdown syntax page.

That page mentions that "for any markup that is not covered by Markdown’s syntax, you simply use HTML itself".

However, using <del> for example to strike through text does not result in satisfactory output. Neither does using some other HTML tags like <strong> or <em>.

Admittedly, <strong> or <em> really don't have to work because Markdown supports bold and italic formatting, however Markdown unfortunately lacks in <del> department, and probably in others too.

Is there a way to show that a text previously existed but now does not, in Trello, if strikethrough is not available?

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This is more a direct feature request to Trello than a question about how to use it – Eight Days of Malaise Mar 2 '12 at 5:14
@EightDaysofMalaise, since I didn't find information about this problem anywhere else, I thought of posting it here to get a definitive answer - maybe I'm the one doing something wrong. I admit, it grew into a bug/feature request the way I worded it at the end. The existence of 'features' and 'wish-list' tags confused me further into thinking this was OK (I now see what 'wish-list' tag is for). Should I remove it or just rephrase it (because I do see questions in the line of "is it possible" when it's clear the feature isn't there)? – Dom Delimar Mar 2 '12 at 8:23
"Is it possible" entirely takes your question away from a feature request as other users can also say how or devs can come along later and say it's not possible. – Eight Days of Malaise Mar 3 '12 at 1:03
@DomDelimar consider editing your question to point to this answer as ~~ now supported in Trello. – Caio Cunha Mar 22 '14 at 16:07
up vote 106 down vote accepted

While you still can't use tags (like <del>), in February 2014, Trello added the ability to cross out text using ~~foo~~.

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This is actually the best answer and should be voted up. – marco-fiset Mar 26 '14 at 11:59
Also works on Github: help.github.com/articles/github-flavored-markdown – Stefan Schmidt May 5 '14 at 9:46

Currently, no. These tags will not be rendered correctly. But the short answer is that they maybe should be.

The Markdown syntax documentation that you reference is the general spec for the Markdown standard, not controlled by Trello or anyone but John Gruber, originator of Markdown. Here's the full quotation:

Markdown is not a replacement for HTML, or even close to it. Its syntax is very small, corresponding only to a very small subset of HTML tags. The idea is not to create a syntax that makes it easier to insert HTML tags. In my opinion, HTML tags are already easy to insert. The idea for Markdown is to make it easy to read, write, and edit prose. HTML is a publishing format; Markdown is a writing format. Thus, Markdown’s formatting syntax only addresses issues that can be conveyed in plain text.

For any markup that is not covered by Markdown’s syntax, you simply use HTML itself. There’s no need to preface it or delimit it to indicate that you’re switching from Markdown to HTML; you just use the tags.

The usage being referred to here is using Markdown to generate things like documentation pages, etc. We don't expect Trello to allow you to insert arbitrary HTML tags in the future.

A better benchmark of what you can expect Trello to support Markdown-wise is this site and the other StackExchange sites, which do support other tags ( <strong>which</strong> <em>do</em> <s>support</s> <del>other</del> <strike>tags</strike> ).

I'll make sure to file a case with the Trello team to support these tags, if possible.

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Will we ever get this? – Paul Nov 3 '12 at 13:38
Did you file a case with Trello, if so post the link in the answer above and I'll definably upvote on their page if possible – CodeBlend Jan 9 '13 at 14:27
It's probably worth mentioning that <strike> has been deprecated and should no longer be used, but <s> and <del> are bot fine. <s> has been repurposed in HTML5 and indicates that the text is inaccurate, while <del> indicates that the text is deleted. I posted my findings here: forums.markdownpad.com/discussion/79/strike-through#Item_2 – Evan Wondrasek Mar 18 '13 at 20:05
This is no longer correct; Trello supports strikethrough via ~~foo~~ – Daniel LeCheminant Feb 11 '14 at 20:51

Use double tildes to ~~strike~~ text in markdown!

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This works in some implementations of markdown, but not in Trello and not here on Stack Exchange. – Niko Nyman Jun 16 '13 at 7:38
This now works on Trello =). @Goutte was just early. – Spina Feb 13 '14 at 14:52

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