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Stack Overflow provides good tools in the question editor, like "Links" and "Styling".

Another thing that for me would be nice is a color selector. Although an HTML editor is available, a direct click on tool would be good, and users can select different colors, as for marking errors in their program with red, and more important data with blue.

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No, seriously. Having colors would enable people to abuse them. Of course, we also have a possibility for people to abuse headlines or subscripts, but colors can be very distracting if not used correctly.

In order to highlight stuff, we already have boldface and emphasized text. If you can't make clear what the error is, for example, you probably need to rewrite a bit.

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    I don't know. Some bad posters will bold everything, but that doesn't happen very often. It's not like people act like SO is myspace. – MPelletier Dec 9 '11 at 13:37
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    But it is essentially useless. There I agree. – MPelletier Dec 9 '11 at 13:38
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    I am asking a question where I have to post a terminal output for a certain issue, and this output is coloured. Even if it's not a must, it would be nice to be able to render the colouring in my question. – Elouan Keryell-Even Apr 8 '15 at 13:53
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    I wanted anti-emphasis though; to grey my text to make it more of a side note. – theonlygusti Jul 6 '15 at 16:58
  • @theonlygusti I fear that's only going to make it harder to read. Like in normal writing, you could simply make it a footnote. – slhck Jul 6 '15 at 19:40
  • @slhck The point is to make it harder to read, and it's more of a header-style message. But yes, I agree completely with your answer about all other colors. – theonlygusti Jul 6 '15 at 20:13
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    I wanted to make a Warning: label yellow or red .. but ok – dylnmc Oct 23 '17 at 20:16
  • Well, I imagine this could be used on philosophy and puzzle. Maybe somewhere else too. – rus9384 Aug 4 '18 at 10:48
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I don't see any value such a feature would give except for adding complexity and the potential for rather horrific looking questions.

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I would like to give an example of a question where colours are used.

enter image description here

I think if used cautiously, colours can help to underline the content of a text very effectively. Of course, the opposite can happen as well; but to me the risk should not be too big.

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    Much agreed. Sad that we can't appeal this? – user238652 Nov 4 '13 at 6:53
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    Nope, nope. Colors do not add any value here. You can as well use Pro: and Contra:. If you saturate your text with bolded and emphasized text, then you would need colors too. But in that case, you should probably reformat your text anyway, instead of adding more formatting. – Olli Feb 19 '14 at 14:08
  • @Olli: Bolding it doesn't even resemble the same effect. The green is clearly meant to draw the eye towards "positive" items, while the red is clearly meant for "negative" items. The eye is already drawn towards the words-as-headings by the giant whitespace around them, making the bold style largely unnecessary. Color-coding, on the other hand, can be immensely useful in reading comprehension. Hence why, for a very relevant example, code editors often have color-coding. And is the issue that bold and italic styles are already very overloaded in semantic meaning. Adding color eases this burden. – MichaelS Aug 27 '19 at 5:39
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This would be particularly useful in providing answers where color is important, without having to opt for screenshots.

An obvious example is making error text clear from normal output; most systems will show console errors in red-on-black to distinguish them from the regular output in white-on-black.

The only argument against seems to be fear of misuse. Any feature can be abused; that's not a reason not to implement something. Just ensure that guidelines on when it's acceptable to use are made clear in the guidelines. The SO community are very good at self-policing, so users will likely quickly learn what's appropriate & fall in with the guidelines.

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as for marking errors in their program with red

In that case, it would not be possible to write code that is formatted as code, and contemporary mark a line with a specific color.
Apart that use case, I don't think there are use cases where the use of colors make the post more clearer than it would be without using colors. What is more important in a post is its content, not the color used for the text, or the background.

  • This is excellent and should be promoted much more! Highlighting one char / word in code is totally useful, but also extremely rarely seen. Seems like nobody knows about this feature. – Sliq Oct 2 '14 at 14:18
  • thanks; this is what I was looking for.. – dylnmc Oct 23 '17 at 20:23
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1) It's already possible to put colors by abusing MathJax for the stacks that support it.

\$\color{red}{\text{WARNING}}\$

Example rendering

red warning

2) A really motivated user could also upload an image of colored text anyway -- just like they could post a unicorn riding a rainbow, if they think the post looks somehow better that way.

Because it's possible to do it by hackish ways, I personally think that it would be fine to allow it natively. Apart from spam posts, we don't see many pictures of unicorns or any abusive content. We don't even see many posts ENTIRELY WRITTEN IN BOLD AND ALL CAPS. So I think we should just trust the users for colors as well.

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