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As per Jeff's suggestion in this comment:

You can use this question as a formatting sandbox. You can

  • edit this question itself (Community Wiki questions such as this one require 100 reputation to edit)
  • post answers to this question (Since this question is protected this requires 10 reputation)
  • post comments to this question or its answers

Beware that since the changes to syntax highlighting in December 2010, and the inline hints added March 2011, no syntax highlighting is applied unless the question's tags or an inline hint enable it. So, to test highlighting here in the sandbox:

  1. Set some language tags to this question:

    • See the explanation and the list of languages.

    • Adding clashing tags, such as both and , enforces a fallback to default, which is different from "no highlighting". (These tags are currently set on this question.)

  2. Or: on the start of a line, specify a language inline using <!-- language: lang --> hints, and indent the code 4 spaces as usual. There is a full list of hints (scroll down a little).

    <!-- language: lang-html -->
        While not hinted otherwise: <html></html> source <b>goes</b> "here".
    <!-- language: lang-js -->
        var a = 3;
        while (not (a > 0)) {
            alert("JavaScript code <b>goes</b> here.");
  3. Or:

    • Save your post.

    • Use something like Firebug (Firefox), Web Inspector (Safari, Chrome) or Developer Tools (Internet Explorer 8) to edit the resulting HTML. To open Chrome Dev Tools, press F12

    • Find the <pre> element and add the attribute class="prettyprint", or change it into something more specific, like class="lang-vb prettyprint".

    • Run the following in the location bar: javascript:prettyPrint();

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What have you tried?‮What have you tried? –  nicael Jul 4 at 16:18
@nicael You're at it again... –  DatEpicCoderGuyWhoPrograms Jul 14 at 0:01

296 Answers 296

script: for i in $1 $2 $3 P

script with backticks and line breaks: P

for i in $1 $2 $3 P
short line P
long line long line long line long line

script with indent of 4 spaces: P

for i in $1 $2 $3 P  
short line P  
long line long line long line long line P

script with <pre> P

for i in $1 $2 $3 P
short line P
long line long line long line long line P

script with <pre><code> P

for i in $1 $2 $3 P
short line P
long line long line long line long line P
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Some apparent whitespace problems, 10 m/s (original post):

The period of a pendulum of length $h$ for small oscillations is $2\pi \sqrt{h/g}$, with $g$ the acceleration due to gravity, about $10 m/s$.


The period of a pendulum of length $h$ for small oscillations is $2\pi \sqrt{h/g}$, with $g$ the acceleration due to gravity, about $10 m/s$.

Update: Meta Stack Overflow does not seem to have the formula stuff that Physics has.

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Be aware that you can run into trouble if you try to use < inside: <code>a<b</code> gives a!

  1. You can't have a backslash \ in the end of inline code in comments. If you try `\\`, then the result will be `\`. You'll have to type `\\ ` and live with the white space being within the inline code.
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Will sanitizer incorrectly strip the p tag at the end? Header 1 Header 1 Header 2

line break test




Have you seen ?

code span<a

more test
test <a

test test test


How about in lists?

  1. li1 unclosed
  2. li2 unclosed


  • li1 unclosed
  • li2 unclosed


  • bla
  • bla

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link test

  1. The parenthesis comes off: http://en.wikipedia.org/wiki/Closure_(computer_programming)

  2. Try escaping the parenthesis with a backslash: http://en.wikipedia.org/wiki/Closure_(computer_programming)

    Looks good in the preview, but watch out!

“the C *P*re*P*rocessor” comes out differently as well.

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test 1 at 12:14 local time –  Pops Jul 27 '10 at 16:14
@Arjan Yeah, I know. I just get annoyed when the server- and client-side rendering disagree. –  Josh Lee Jan 31 '11 at 19:59

Testing a possible edit bug...

Here's the first edit...

And here's the second -- perhaps as a new post.

Okay so far, will try one more time...

Final test

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Testing out this new Userscript I'm building. One more edit to make sure this thing works.

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Unix time, or POSIX time, is a system for describing points in time, defined as the number of seconds elapsed since midnight proleptic Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seconds. It is used widely, not only in Unix-like operating systems, but also in many other computing systems and file formats. It is neither a linear representation of time nor a true representation of UTC (though it is frequently mistaken for both), as it cannot represent standard UTC leap seconds (e.g. December 31, 1998 23:59:60), although otherwise the times it represents are UTC. –  Yi Jiang Oct 31 '10 at 8:30

Comments test. Checking various comment related stuffs

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testing revision diffs blah blah

  • new line
  • new line2

  • this foobar quote

    • boo boo boo
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XSS testing:

an alert

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i wrote sending email function that only work my debug mode(debug local server) when i publishing and hosting C# code that function not work. this my email configuration function

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How about some backticks ``?

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Intraword italics formatting

  • SID: S-1-5-21 domain-512

  • SID: S-1-5-21*domain*-512

  • SID: S-1-5-21\s*domain*-512

  • SID: S-1-5-21domain-512. SID: S-1-5-21<em>domain</em>-512


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$$ \begin(equation} \chi(M_g) = 2-2g \end{equation} $$

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Select * from Foo where Foo.bar == "baz"
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Syntax highlighting test

<!-- language: lang-bsh -->

# Catch obstrusive tracking parameters like ...
# ?utm_source=twitterfeed&utm_medium=twitter or
# ?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+wdrss+(WDRSS)
# ... because they generate doubled content.
RewriteCond %{QUERY_STRING} utm_source= [NC,OR]
# Some people put their own URIs into this parameter. May be better banned.
RewriteCond %{QUERY_STRING} ^p=\D
# The trailing question mark removes the query string.
RewriteRule (.*) /$1? [L,R=301]
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HTML markup won't work in SO.. testing it here.

<a title="jhddj" rel="relImageStatusUpdate" href="<%= format_status_image_url(row["UserID"],row["USERSTATUS_ID"]) %>" 
<img alt="" 
src="<%= format_status_thumbnailimage_url(row["UserID"],row["USERSTATUS_ID"]) %>"/></a>

Trying pure HTML without the ASP.NET stuff:

<a title="jhddj" rel="relImageStatusUpdate" href="#" id="ahrefStatusImage"> 
<img alt="" src="myimage.gif"/></a>
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Inline editing test!


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Not formatting, but converting answer to comment.

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Whoa, look at this crazy empty blockquote!


Which isn't even remotely as crazy as this one:



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There's always a crazier way! –  Arjan Aug 26 '11 at 19:53

Could you tell that this wasn't just an empty blockquote before you hovered?

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Testing non breakable spaces in answers.

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Testing the revision history when a tag is removed from the end of a post:

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formatting test test test

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Wondering if an anchor link to an answer works...doesn't look like it.

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<!-- language: lang-java -->

import java.util.ArrayList;
import java.util.Collection;
import java.util.Stack;

public class FlushStack<E> extends Stack<E> {

    public Collection<E> get() {
        ArrayList<E> elements = new ArrayList<E>();
        return elements;

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alert("testing .how to escape tags such as script")

I herefor occupy this answer in the name of Good! Now get off my answer!

[Cool Hyperlink]1

Cool Hyperlink

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Unless you're trying to find some exploit, see How do I format my code blocks? –  Arjan May 10 '11 at 6:29

Testing <pre><code>some-code here\n</code></pre> against some Markdown-formatted code:

<input type="checkbox" name="applyChanges" />

This time with a line break after the <pre>:

<input type="checkbox" name="applyChanges" />

Now for the Markdown formatting:

<input type="checkbox" name="applyChanges" />
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