Okay, what I did was I went to my story on AO3 and clicked the "Share" button at the top of the page. That generated the code for what I posted -- I deleted the Chapters line -- and I just pasted it into the post form. Super-zippy way to post a header & link!
But! In Dreamwidth, you can just type [user name="user" site="archiveofourown.org"], and it will automatically insert the AO3 icon in front of the user name. LJ doesn't support that feature, though.
Getting the user icons from LJ/DW to post on AO3 requires getting the code for them, but I'm not sure how much of the source code is actually needed? (I tend to be lazy and just go with unformatted names.) Maybe someone can help us out with that.
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But! In Dreamwidth, you can just type [user name="user" site="archiveofourown.org"], and it will automatically insert the AO3 icon in front of the user name. LJ doesn't support that feature, though.
Getting the user icons from LJ/DW to post on AO3 requires getting the code for them, but I'm not sure how much of the source code is actually needed? (I tend to be lazy and just go with unformatted names.) Maybe someone can help us out with that.