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When I write a comment, I don't know how to go to the next line because if I press Enter button It will submit the comment.

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    $\begingroup$ No, $$\quad$$ it's $$\quad$$ not $$\quad$$ possible. :) $\endgroup$
    – Daniel R
    Aug 6, 2014 at 9:35
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    $\begingroup$ @Daniel,$\tag*{}$Also using subtler methods.$\tag*{}$--- Asaf. $\endgroup$
    – Asaf Karagila Mod
    Aug 6, 2014 at 9:46
  • $\begingroup$ There are several older discussions, for example: meta.math.stackexchange.com/questions/3856/…, meta.math.stackexchange.com/questions/12927/…, meta.math.stackexchange.com/questions/1309/… $\endgroup$ Aug 6, 2014 at 9:51
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    $\begingroup$ For long comments, I always use the answer box to edit it first and then copy and paste it to the comment box when it is ready. $\endgroup$ Aug 6, 2014 at 9:53
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    $\begingroup$ As I mentioned in an old thread, one can use $ $ \tag*{} $ $ in MathJax to force a newline in comments. $\endgroup$ Aug 6, 2014 at 12:28
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    $\begingroup$ Thanks for you answers. $\tag*{}$ Why so many thumbs down? $\endgroup$
    – Shabbeh
    Aug 6, 2014 at 12:43
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    $\begingroup$ @Shabbeh: I did not downvote, but the downvotes are probably along the lines of Mad Scientist's answer. I also expressed the same sentiment in this comment. $\endgroup$
    – robjohn Mod
    Aug 6, 2014 at 12:48
  • $\begingroup$ Related: Linebreaks in comments don't seem to be working $\endgroup$
    – MJD
    Aug 7, 2014 at 1:28
  • $\begingroup$ TEST: $\tag*{Success}$ $\endgroup$
    – MathMan
    Sep 2, 2014 at 0:04

2 Answers 2

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There is no next line in comments, comments are meant to be short and line breaks are intentionally not allowed.

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  • $\begingroup$ I agree with you but sometimes it gets too messy especially when you are using LaTeX. $\endgroup$
    – Shabbeh
    Aug 6, 2014 at 9:12
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    $\begingroup$ @Shabbeh If you only want a new line while editing, so that you can better proof-read what you're writing, and don't insist on it being rendered, then you can type Shift+Return, that places the cursor on the next line, and does not submit. $\endgroup$ Aug 6, 2014 at 12:24
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    $\begingroup$ @Shabbeh: with any LaTeX, if things become too crowded or confusing in \textstyle, formulas can be set in \displaystyle. Just use $$...$$ $\endgroup$
    – robjohn Mod
    Aug 6, 2014 at 12:46
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    $\begingroup$ My general rule of thumb: if you want a "new line" to separate paragraphs, you should probably start a new comment. $\endgroup$
    – apnorton
    Aug 9, 2014 at 14:27
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Promoting information in the comments to an answer for visibility.

Shift+Enter will move to the next line in the edit window, but this will not render as a newline in the output (it renders as a space).

To force newlines in the output we can use MathJax. By quoting Asaf's comment above in a Chatroom, you can see how the sausage is made:

@Daniel,$\tag*{}$Also using subtler methods.$\tag*{}$--- Asaf.

If you can't remember to use $\tag*$, you might also remember that the code $$...$$ also starts on a new line, so an essentially empty version of this also makes a newline. This is how Daniel R's comment works (see this chatroom message):

No, $$\quad$$ it's $$\quad$$ not $$\quad$$ possible. :)
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  • $\begingroup$ $\text{You can also use \\\\ and \\text\{\}}\\ \text{inside MathJax}$ $\endgroup$ Jul 29 at 0:44

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