Lemmy follows Commonmark. There's a spec and tutorial there
this post was submitted on 18 Nov 2023
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As well as some custom syntax that isn't covered for spoilers ie:
LABEL
HIDDEN TEXT
Sadly, not all Lemmy clients support it yet, so be careful with spoilers.
Voyager doesn't do spoilers, and I think it uses a different standard. It was giving me underscores when I would press the italics button...
EDIT: Looks like the standard still works though!
Does it actually, though?
I'm not trying to insinuate that it doesn't. I'm just jaded at how many mutually exclusive Markdown-adjacent standards there are out there, and how many implementations there are which claim to adhere to one of the major standards but in actuality either don't fully support it, extend it with their own nonstandard bullshit, or both.
On thunder you
have ~~buttons~~
- to insert
the various
formatting.
Also the only app that I know to have double-tap-slide to adjust the zoom on images precisely with one finger, since I implemented it.
I also implemented the "dismiss read" feature that I was missing from Relay for reddit, letting you remove read posts from your feed without refreshing it.
The settings let you adjust the UI a lot more than most apps, I think.
The latest update finally allows opening lemmy links in Thunder, and creating posts using the system share dialogue from other apps.
Exiting a comment/post you're writing without finishing them, saves them as a draft so you can come back and continue editing where you left it.
You can now see and create cross-posts.
I'm one of the mods of !homevide@feddit.uk and I quite often post press releases of new and upcoming Blu-rays, 4K etc. The most annoying part was when copying and pasting press releases from websites, the formatting would be almost completely lost. Lists of special features would be transformed into block paragraphs.
But, the other mod of !homevideo found this web page where you can paste the text onto and it becomes converted into markdown text. I can then copy the new text and paste it into Lemmy and it now looks great, with bullet point lists preserved etc.
Right now, aside from the basics, there is no proper way to use Markdown in Lemmy because different clients interpret it differently.
One fun tip is that if you're not sure how someone formatted a post the way they did, you can (at least on the default UI) use the "view source" icon
to take a peek. It works on comments as well although you might have to click the three dots under a comment to expand and see all the icons.
If you're on an instance that doesn't allow image uploads and you're hosting externally, the most useful markdown for you is  which will embed the actual image instead of you just having to post a link.
What is markdown?
Markdown is almost like html but not that complex you can add headings, lists, hyperlinks etc etc using it