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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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1  
What have you tried?‮What have you tried? –  nicael Jul 4 at 16:18
1  
@nicael You're at it again... –  DatEpicCoderGuyWhoPrograms Jul 14 at 0:01

296 Answers 296

will the "hai" in the beginning be removed?

Original: Hai, will the "hai" in the beginning be removed

Yes!

Ref: Should 'Hi', 'thanks,' taglines, and salutations be removed from posts?

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi ullamcorper, eros ut faucibus dapibus, nibh nunc lacinia ligula, et sagittis nibh lorem at purus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Praesent scelerisque turpis nec eros luctus fringilla. Curabitur vitae lacus a sem posuere sollicitudin in at sapien.

  • Sed ac augue sapien, varius congue dolor.
  • Aliquam at enim eget purus gravida faucibus vitae et justo.
  • In et mauris ac dolor consectetur blandit.
  • Pellentesque aliquam vehicula felis, nec eleifend turpis tincidunt id.

Nunc laoreet lectus tempor massa tempus bibendum. Suspendisse potenti. Nunc euismod, dolor vitae pharetra dictum, justo nisi dignissim lectus, elementum ornare quam felis eget turpis. Praesent vel felis eget eros scelerisque condimentum. Suspendisse eu elit id turpis dictum imperdiet. In hac habitasse platea dictumst. Duis tempor ligula eu enim suscipit vitae pulvinar dui cursus.

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I find it hard to believe, with the amount of rep that you have, that you would consider simply linking to another question is all it takes to make a good answer?

If your answer to question A can be used in question B, that suggests that B is a duplicate of A and can be closed as such.

If they are not duplicates, then you should be answering the question. Tailor your code to answer the actual question asked.

It has been well established that answers which contain nothing more than links will likely be deleted. They may be converted to comments, or they may not. There are plenty of related discussions here.

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This should be code:

$VAR1 = { 'P5' => {   'E' => '06' => [100, 200, 95] 'B' => '23' => [20, 1000, 05, 30]   },   'P2' => {         'C' => '24' => [18, 23, 2300, 3456]   },   'P1' => {         'A' => '12' => [24, 25, 3200, 5668]         'D' => '15' => [168]       } };

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I'm testing inbox notifications. If you comment on this, you will receive one (1) vial of virtual unicorn horn dust (no actual unicorns will be harmed).

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2  
SHUT UP AND TAKE MY MONEY –  Yi Jiang Feb 28 '12 at 7:41
1  
So then this is artificial virtual unicorn horn dust? –  animuson Feb 28 '12 at 7:48

I am a crazy editing person.

Third try.. fourth.

Verified through attempts to revert this post that I am unable to do so via mobile. selecting the original in the list has no effect at all.

trying to go beyond the edit grace period to add another item to the list...

I am able to see the edits in the list, but I can't do anything with them.

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Just some test for comments...


<img src="http://graph.facebook.com/zuck/picture" width="50">

http://10.0.0.10/example.com - apparently this is not allowed anymore :) &&

123

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3  
¹ ² ³ ⁴ ₁ ₂ ₃ ₄ –  Arjan Apr 30 '12 at 8:45
2  
And the 𝓬𝓱𝓪𝓻𝓪𝓬𝓽𝓮𝓻𝓼 looks much better for you! But the emoji is not "whitespace", too bad ;-) –  Arjan Apr 30 '12 at 9:28

Test for edit comment within first grace period.

Edit 1, with edit summary
Edit 2, with edit summary
Edit 3, no edit summary
Edit 4, with edit summary
Edit 5, with edit summary
Edit 6, after 9 minutes, with edit summary
Edit 7, after 9 minutes, with edit summary, overwriting previous summary
Edit 8, after 10 minutes, no edit summary

Editing within grace period no longer remembers previous edit reason?

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Testing lists.

  1. This is a list followed by indented text

    This is the indented text

  2. This is a list followed by []() and indented text

This is the indented text
  1. This is a list followed by <!-- --> and indented text
This is the indented text
  1. This is a list followed by &#x200B; and indented text

This is the indented text
  1. This is a list followed by &#x200C; and indented text

This is the indented text
  1. This is a list followed by &#x200D; and indented text

This is the indented text
  1. This is a list followed by a pasted 200B and indented text

This is the indented text
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Tabs FTW

And this is just some padding text so I can actually answer.

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This is a test of a broken hyperlink: http://www.iana.org/domains/example/blahbllabh http://www.iana.org/domains/example/blahbllabh http://www.google.com/blahblabhalbhablahbal

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Testing to see if equations (TeX) are supported using any of the longhand environments:

[ x^2 ]

$$ x^2 $$

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Trying to figure out the proper way to format italic_NONITALICFORWARDSLASH_italic with no spaces:

*macro*/*conditional* - macro/conditional
*macro*\/*conditional* - macro/*conditional*
*macro*//*conditional* - macro//conditional
**macro*/*conditional** - macro*/*conditional

This is already done here:
You need HTML-formatting <i></i> or <b></b>
<i>macro</i>/<i>conditional</i> - macro/conditional

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<table>attempting to inject a *not supported tag</table>

<p>or an allowed one?</p>

*http://meta.stackexchange.com/a/135909/179635

edit: it is pointless, they are escaping &lt; and &gt; correctly

but well, I managed to find a way to prevent them to stripe off non supported tags :)

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On my E8200 box this doesn't occur, but on my Atom N450 netbook (both running OpenSuse 11.2), whenever I read the CPU's TSC, the returned value is mod 10 == 0, i. e. it is without remainder divisible by 10. I'm using the RDTSC value for measuring times that interesting pieces of code take, but for the purpose of demonstration I've made up this little program:

        .text
        .global _start

_start: xorl    %ebx,%ebx
        xorl    %ecx,%ecx
        xorl    %r14d,%r14d
        movb    $10,%cl
loop:   xchgq   %rcx,%r15          # save to reg
        cpuid
        rdtsc
        shlq    $32,%rdx
        xorq    %rax,%rdx          # full 64 but of RDTSC
        movq    %r14,%r13          # save the old value
        movq    %rdx,%r14          # copy current
        movq    %r14,%rsi          #  argv[1] of printf()
        subq    %r13,%rdx          #  argv[2] (delta)
        leaq    format(%rip),%rdi  #  argv[0]
        xorl    %eax,%eax          #  no stack varargs
        call    printf
        xchgq   %rcx,%r15
        loop    loop

0:      xorl    %eax,%eax
        movb    $0x3c,%al
        syscall

        .size   _start, .-_start

        .data
format: .asciz     "rdtsc: %#018llx = %1$llu -- delta: %llu\n"

(I usually use my own routines for converting, but to prevent readers from suggesting that the error might be there, I'm just using printf() here.)

With the above code, the output is (for example):

rdtsc: 0x000b88ef933ffd06 = 3246787292822790 -- delta: 3246787292822790
rdtsc: 0x000b88ef9342fcf4 = 3246787293019380 -- delta: 196590
rdtsc: 0x000b88ef93435dca = 3246787293044170 -- delta: 24790
rdtsc: 0x000b88ef9343b43c = 3246787293066300 -- delta: 22130
rdtsc: 0x000b88ef93440c34 = 3246787293088820 -- delta: 22520
rdtsc: 0x000b88ef9344604e = 3246787293110350 -- delta: 21530
rdtsc: 0x000b88ef9344b4d6 = 3246787293131990 -- delta: 21640
rdtsc: 0x000b88ef9345085a = 3246787293153370 -- delta: 21380
rdtsc: 0x000b88ef93455d96 = 3246787293175190 -- delta: 21820
rdtsc: 0x000b88ef9345b16a = 3246787293196650 -- delta: 21460

As can be easily seen, the delta varies in reasonable amounts. But conspicuous (not to say conspired ;-) is that the least significant decimal digit is always 0.

I've observed this phenomenon for more than two years now, and stackoverflow.com is not the first address where I make this issue public. But nowhere I got a reasonable answer yet. The ideas we (me and other people out there) came up with, are that

  • the TSC is incremented only every 10th cycle, but then by 10, or
  • the TSC is internally updated correctly, but reflected to the outside only every 10th cycle, or
  • the TSC is incremented by 10 each cycle.

None of these points really make sense, however. I should have actually run a program like that on the E8200 (which is currently out of order) to see if the order of magnitude of the deltas is the same or only a tenth of those in the above output. (Any volunteers?)

Googling didn't help, Intel's manuals did neither.

When discussing with other people, there was no-one else who experienced the same behaviour. If it had to do with the kernel, then at least 3 versions were affected, but then... what does the kernel have to do with it?

I've also had the netbook in service, and it came back with a new motherboard — implied a new CPU, so at least two individual entities of N450 must be affected.

I've also took measures against clock frequency changes (and no matter what frequency I fixed the clock to, the values varied only in the expected range (the same as shown)), and switched off HT, though these should actually help to get some other least significand digits, rather than preventing them. But just to be sure.

Well, if anyone wants to run the program on their machine, the command line is (provided you save the source in a file rdtsc.s):

as rdtsc.s -o rdtsc.o
ld --dynamic-linker=/lib64/ld-linux-x86-64.so.2 rdtsc.o -L /lib64 -l c -o rdtsc

In order to build it with the gcc frontend, i. e.

gcc -l c rdtsc.s -o rdtsc

you must add (or replace the _start: label with) a main: label and make it global.

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#include <unordered_map>

int main() {
    std::unordered_map<int,int> m;
}

Testing two edits without a second edit summary. This is the first edit. This is the second edit. A third unsummarised edit.

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1  
Bold text = Bold text and Italic text = Italic text or Italic text = Italic text –  TheLQ Jun 30 '10 at 19:15

And this is a...

Spoiler!

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Multi-line spoiler:

Spoiler line 1 (note the two spaces at the end of this line and the next)

Spoiler line 2

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URLs cannot contain parentheses?

Is it the space?

It works with urlencode though

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testing slashes escaping in backticks code in answers \, \\ and \a, \\a

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Code:

this is
a test

Result:

this is a test

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Testing markdown. Thanks Arjan

valid XHTML

unfunny.

unfunny.

Oh gee look, you can so too underline in Stack Exchange sites:

 ̲u̲n̲d̲e̲r̲l̲i̲n̲e̲ ̲

 ̳u̳n̳f̳u̳n̳n̳y̳

 ̳u̳n̳d̳e̳r̳l̳i̳n̳e̳ ̳

  ̲̅M̲̅C̲̅M̲̅X̲̅C̲̅I̲̅X̲̅ ̲̅

  ̲̅m̲̅c̲̅m̲̅x̲̅c̲̅i̲̅x̲̅ ̲̅
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share|improve this answer
1  
​​​​​​​​​​​​​​​ –  brasofilo Sep 10 '13 at 23:29

Mouse over the left of the tower of hello

Yay you can follow instructions hello

Apparently <kbd> is immune to spoilers

hi

hi again

hi yet again

potato

why is this text drifting out

help

! spoilers don't work now?

! hey that's messed up


now they do?!?!

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I've always wondered how to put a backtick in a backtick, now I know. Use 2 backticks as delimiters. ``.

SELECT `a` from `table` where `b`=`c`;

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1  
Documented here, Rocket. –  Arjan Feb 4 '13 at 17:52
starts with codez

w00t woot

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Testing lists with large code blocks

  1. Test

    0
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    Next one has no leading text

  2. 0
    1
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