646

Notes:

  • Answers will occasionally be moved to the Sandbox archive when there are too many of them. When using them to report bugs, keep an eye on the post.

  • You may also want to take a look at the Stack Exchange's Sandbox chat room

  • This site, Meta Stack Exchange, is usually used as a "test bed" for pending changes happening to the way text is rendered on all network sites. Changes to text rendering that are going to be rolled out to the network are usually deployed here first to test them out and fix any potential glitches. Currently, there are no such changes pending, but if there were, keep in mind that text posted here may render differently from the other sites until the changes roll out to them as well.

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 only 100 reputation to edit instead of 2,000)
  • post answers to this question (This question might be protected, requiring earning 10 reputation on this site to answer)
  • post comments to this question or its answers
  • test suspected bugs with the editor or the rendering
  • post ponies (only when mods are asleep)

Beware that since the changes to syntax highlighting in December 2010, and the inline hints added in 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. As of January 8, 2019, you can use GitHub-flavor fenced code blocks in your posts, specifying the language after the opening fence:

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

    • Create code blocks in any way (using the fence notation above, the four-space indent form, or using HTML <pre><code> tags).

    • Save your post!

    • Use your browser's developer tools to edit the resulting HTML. To open developer tools, press F12, or ⌥⌘ I on Mac.

    • Find the <pre> element and add the attribute class="prettyprint", or change it into one of the valid syntax hints linked above, like class="lang-vb prettyprint".

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

Answers that are considered annoying or obnoxious, or that cause breakage for users, will be deleted. This is codified as a policy as of March 29, 2018.

4

292 Answers 292

1 2 3
4
5
10
2

Render example for a Stacks editor bug report:

  • One (this point is italic in the editor)
  • Two
  • Three

This is italic, and because of a lack of termination (#21), everything after is italic

Regular text

1
  • Ignore, test comment to see if the comment archive is working Mar 29 at 21:53
2

Comment on this question: Why has the parsing of the &nbsp; in tables changed?

Adding &nbsp; isn't useful, just use correct markdown, you are missing a "|".


Your example:

So that instead of this: I get this:
table without the non-breaking space table with the non-breaking space                                                          
Looks much better, right?

My example (use image and specify width): |1. I get this: | | |--|--| | | |

My example (no non-breaking spaces): |2. I get this: | | |--|--| | table without the non-breaking space | 2 3 |

My example (with a small number of non-breaking spaces): |3. I get this:      | | |--|--| | table without the non-breaking space | 2 3 |


Adding the non-breaking spaces changes the size of the right column.


Notes:

Allowed attributes for <img>

The following attributes are allowed on the tag, in the order shown below. Note that the mobile theme enforces a maximum width of 90%, so specifying a height might not scale the image proportionally on the mobile sites.

Attributes must be specified in this order. You may omit attributes you do not want to specify, but specifying a later attribute before an earlier one will strip the tag.

  1. src=""
  2. width="" (1–999; plain number without any extensions like px)
  3. height="" (1–999; plain number without any extensions like px; pay attention to order warning above)
  4. alt=""
  5. title=""

You would be better off using percentages to enforce a specific ratio of the images while using three separate images, but using a single image of a grid is probably the best solution.

2

Formatting of images in tables:

These examples are made to see what methods work for getting the most out of a table's space.

Default behaviour:

The table adapts to the contents of the first cell, and the contents of the adjacent cell(s) are adapted to that of the first.
The second image in the second cell is forced below the first using a <br/> (or two, rather, so the images have a better looking gap between them):



Using the &nbsp;

Using the HTML &nbsp; entity to fill out the empty space due to the table cells adjusting to the width of the contents of the first cell:



                                                       

Using &nbsp; and <br/>

Using that same trick but preceded by a <br/> to force that the line of non-breaking spaces below the image (such a line can also be put above the image, logically), to prevent the scrollbar from appearing (thank you @Makyen!):




                                                                

Using <img> entities with custom width set

Different aspect ratios behave differently, and there is still a lot of unused space in the table:



Using <img> entities with width and height

It takes a lot more work, but it's indeed doable (the burden of being a perfectionist, I presume). The numbers are guesswork, and the aspect ratios obviously don't correspond with the true dimensions of the images, but it looks good:



Width = 320, height = 640 Width = 370, height = 305 (of both images)

And here's how they all look when the viewport's width changes to something more narrow:

enter image description here

It seems the table with the images in <img> and only their width set wins the beauty contest when viewports of widths < 1265 px are taken into consideration, until the breaking point at 980 px occurs, and the right sidebar is removed. But then it immediately adapts to the viewport's width, so it only looks okay - depending on contents - for a few tens of pixels.

2

not quoted, but highlighted

printf("here's some code\n");
int x = 99 + 100;

quoted and highlighted

printf("here's some code\n");
int x = 99 + 100;
2

You should call foo(bar = TRUE). The bar argument is very important because it prevents foo overflow.

1
  • Thanks, this really helped! May 19, 2022 at 15:45
2

Stacks editor is broken. This is a proof.

Proof
2

Testing spoilers and code fences:

none ! code block ! Text block none ! code block ! Text block

Hmm...

none ! code block !
Text block
none ! code block !
Text block

none code block
Text block asd asd
Text block

2

The following text is from answer to: "How to indent a few lines in Markdown markup?" by AgainPsychoX. It is under a CC BY-SA 4.0 license.

This is normal text.


This gets indented, without enumeration nor dots.

Multiple levels seems to be possible?

Yes, but syntax gets messy, unless you write it single line :)
2

Testing something with new editor and its ability to convert local links to question titles.

Some links which should get converted to question titles:


Highlighting:

print('test')
0
2

Testing server-side rendering of NBSP in inline code:

" ".join(map(shlex.quote, sys.argv))

2

Text Fragment Linking

test1 [text](link)

test2 [text][ref]

test3: https://example.com/#:~:text=illustrative%20examples

test4: https://example.com/#:~:text=illustrative%20examples

test5 <a href="">...</a> works

<a href="https://example.com/#:%7E:text=illustrative%20examples">
<a href="https://example.com/#:%7E:text=illustrative%20examples">
<a href="https://example.com/#:%7E:text=illustrative%20examples">
<a href="https://example.com/#:%7E:text=illustrative%20examples">
<a href="https://example.com/#:~:text=illustrative%20examples">

Using all allowed URL Code points

https://url.spec.whatwg.org/#url-code-points

test1

test2

test3: https://example.com/!$'()*+./:;=?@_~&,-

test4: https://example.com/!$'()*+./:;=?@_~&,-

test5

<a href="https://example.com/#!$%27()*+./:;=?@_%7E&amp;,-">
<a href="https://example.com/#!$%27()*+./:;=?@_%7E&amp;,-">
<a href="https://example.com/#!$%27()*+./:;=?@_%7E&amp;,-">
<a href="https://example.com/#!$%27()*+./:;=?@_%7E&amp;,-">
<a href="https://example.com/#!$%27()*+./:;=?@_~&amp;,-">

  • ~ : percent-encoded, unless <a> element used.
  • ' : percent-encoded always
2
text match regex replaced
`` .* foo
a .* foofoo
ab .* foofoo
^.*$ foo
a ^.*$ foo
ab ^.*$ foo
2

Tabs being converted to spaces

In code fences:

    this is a test
    this is a test
    this is a test

In a <pre><code> block:

 this is a test
    this is a test
    this is a test

In a <pre><code> block using HTML entities:

	this is a test
	this is a test
	this is a test
2

This is a test image:

enter image description here

2

HTML stuff (markup) in a Markdown table:

syntax /
     example
explanation / comment
thing1:thing2 Greek letters:
  • alpha,
  • beta, and
  • gamma (γ).
2

this is a test of embedding links into block quotes

2

Test wrong formatting from new editor:

Single line

`

const hello = "world";

`

Multi line

`

const hello = "world";

const foo = 42;

console.log(hello, foo);

`

Single line more backticks

`

const hello = "world";

`

Multi line more backticks

`

const hello = "world";

const foo = 42;

console.log(hello, foo);

`

2

Table | Foo | Bar | Baz | | --- | --- | --- | | 123 | 456 | 789 |

Fullwidth symbol and URL:https://example.com/

The rendering of the preview during editing and the actual rendering are different.

1
2

Posting an answer so that I can test stuff with comments

Editing so that other reviewers don't have to waste their time on a formatting sandbox answer (editing from the review queue marks the review item as completed).

1
2
Site Step 1: Draft your question
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  • 2
    • Is this an actual request to delete this?
      – Joachim
      Mar 18, 2023 at 9:10
    • 1
      @Joachim Thanks. I used "delete", not to delete the the post but delete the answer body.... I assumed that some html tags should not caused problems but I was wrong. By the other hand, the problem is now solved... the post might be deleted or archived now.
      – Rubén
      Mar 18, 2023 at 15:32
    2

    This answer is to test some more complex link and image Markdown syntax.

    The image used is:

    The original intent for this answer was to verify some more complex link and image Markdown to make sure that a couple of userscripts were parsing it correctly. However, in the process of creating these, I encountered a bug in at least the SE post preview parsing of the Markdown. I don't know until saving this if there are issues in the backend processing.

    Bug identified (only SE post preview; works in post rendered in the backend: i.e. once it's saved):

    No support for multi-line tooltips

    Simple examples: working demo on CommonMark site
    More complex examples
    multi-line text + image + multi-line text with multi-line tooltips (inner and outer) working demo on CommonMark site; not working in SE post edit preview
    multi-line text + image + multi-line text with tooltips (inner and outer, both multi-line); working demo on CommonMark site; not working in SE post edit preview

    Links:

    named/numbered: [link text][ref] format

    "normal"
    • Icojam-Weathy-24-tornado.png
    image with tooltips (inner and outer)
    • Icojam-Weathy-24-tornado.png
    text + image with tooltips (inner and outer)
    text + image + text with tooltips (inner and outer)
    multi-line text + image with tooltips (inner and outer)
    multi-line text + image + text with tooltips (inner and outer)
    multi-line text + image + multi-line text with tooltips (inner and outer)
    multi-line text + image + multi-line text with multi-line tooltips (inner and outer) working demo on CommonMark site; not working in SE post edit preview

    [link text](URL + optional title/tooltip) syntax

    "normal", no tooltip
    • Icojam-Weathy-24-tornado.png
    link with tooltip
    image with tooltip (inner and outer)
    • Icojam-Weathy-24-tornado.png
    text + image with tooltip (inner and outer)
    text + image + text with tooltip (inner and outer)
    multi-line text + image + text with tooltips (inner and outer)
    multi-line text + image + multi-line text with tooltips (inner and outer)
    multi-line text + image + multi-line text with tooltips (inner and outer, both multi-line); working demo on CommonMark site; not working in SE post edit preview

    More variations: different delimiters

    link with tooltip (escaping the delimiter; should work in posts)

    SE Chat: More variations, different delimiters

    SE Chat doesn't require escaping the delimiter on a tooltip interior to the tooltip and will display the escape. It also doesn't support a delimiter other than ".

    link with tooltip (NOT escaping the delimiter; should not work in posts) See these in chat starting here

    The following do not, and should not, work in SE posts. They are specific to SE Chat, which uses a different Markdown parser with somewhat different and more limited syntax.

    • [title using " as delimiter](https://example.com/foo "tooltip: "tooltip: this is a title/tooltip [], with something in [brackets], (parenthesis), 'single quotes', and "double quotes" which don't use escaping; and all escaped [brackets], (parenthesis), 'single quotes', and "double quotes". Delimiter at the "end""): Works in SE chat, but the escaping for the single and double quotes is displayed in the title. The escaping of the parentheses and brackets are not displayed.
    • [title using " as delimiter; not escaping delimiters](https://example.com/foo "tooltip: "tooltip: this is a title/tooltip [], with something in [brackets], (parenthesis), 'single quotes', and "double quotes" which don't use escaping; Delimiter at the "end""): Works in SE chat, with correct display in the title/tooltip, due to not escaping any delimiters.

    Examples from CommonMark spec

    Multi-line title: Example #196 from CommonMark spec (live CommonMark demo) NOT working in post edit preview:

    foo

    2

    This is strikethrough font: abc

    This is strikethrough font: <s>abc</s>
    
    2
    <kbd><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
    </kbd>
    

































































































































































































































































































































































































































































































    17
    2

    So this is just a test of snippets. I see how it works: when you enter code, then click Results, nothing happens. You have to submit it, then it will work, then, finally, you can post your answer. Three steps instead of two. Okay. I just wish I could post all the nice little snippets I've accumulated over the years for my own use. Can't do that, because SO has lots of rules and it is easy to get banned. I know; I have. I'm very careful when I post questions, not to post them in the form of "here is a neat way to do something".

    alert('hi');
    .a {color:green;}
    <div class=a>Test</div>

    1
    • Very nice. I like snippets! Aug 17, 2023 at 21:03
    2

    A new list?

    1. This.
    2. That.

    Edits. Grace period edits?

    image for testing

    2

    Wait, what!?! I don’t own The Nineteenth Byte!

    strange…

    2

    Placeholder 4️⃣ some tests…


    text


    text

    Testing backslash:

    @backslash not showing, right?

    Code:

    \@backslash not showing, right?
    

    https://www.example.com

    Let's upload a small image and see if it gets bigger:

    sample image, 288x268 pixels

    Original image is 288x268 pixels.

    2

    Raw links are linkified differently in live preview and rendered result?

    Code https://github.com/
    Code:https://github.com/
    Code: https://github.com/
    Code - https://github.com/
    Code!https://github.com/
    Code.https://github.com/
    Code https://github.com/
    Codehttps://github.com/

    In live preview, the links are linkified if immediately prefaced by a punctuation. If the rendered result, a space is required.

    1

    I’m testing hyphens ("HYPHEN MINUS") on iOS 12. Specifically, typing multiple hyphens into the edit box. Typing 2 hyphens together results in a single "EM DASH".

    Related question on the Ask Different Stack:
    How do I type a hyphen in iOS 12?

    The text in parentheses describes the resulting string after typing N hyphens.

    Below this line is a single “hyphen” (HYPHEN)

    -

    Below this are 2 hyphens (EM DASH)

    And 3 hyphens (EM DASH + HYPHEN)

    —-

    Four hyphens (EM DASH + EM DASH)

    ——

    -—

    Five hyphens (EM DASH + EM DASH + HYPHEN)

    ——-

    Long press and second character (EN DASH)

    Long press and third character (EM DASH)

    Copy/paste




    Hello -

    • (BULLET - Long press and first character)

    Saying "hyphen hyphen hyphen hyphen" results in 4 contiguous hyphens


    Saying "dash" results in an "EN DASH" and "dash dash dash dash" results in 4 x "EN DASH + SPACE" (not contiguous).

    – – – –

    1

    or so
     you claim

    0
    1 2 3
    4
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    10

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