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How do I format my code blocks?

When I put HTML into the form field for Stack Overflow questions, it doesn't show up. Why is this, and is there a way to get HTML markup to show up?

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migrated from Oct 24 '11 at 4:50

This question came from our site for professional and enthusiast programmers.

marked as duplicate by kiamlaluno, Lance Roberts, Won't Oct 24 '11 at 14:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Maybe you should read the bar at the right of the textarea where you write your question, or better yet. – kuroir Oct 24 '11 at 4:47
See this as well: – Shadow Wizard Oct 24 '11 at 7:59
up vote 3 down vote accepted

Paste your code in the text area; select your HTML code, and click on the "{}" icon above. The code will get indented, and it will show the code in your question.

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It doesn't show up because it gets parsed as (invalid) HTML. You can use HTML to format your post, and it doesn't get shown if it's used for formatting. Here's the list of valid HTML tags. As that page says,

HTML tags not on this list are stripped from the output.

Notice that, for example, <html> is not on that list. If you have a pair of <html> tags at the start and end of your sample, they will be stripped, and your sample will display nothing at all.

You need to tell the parser not to render the sample, and instead to display it. You can do that in one of three ways:

  1. For short, inline samples like my use of <html> above, use backticks (next to the 1 on your keyboard). The above line looks like:

    my use of `<html>` above
  2. For longer samples, use block code formatting. To do this, indent every line of the block by 4 spaces. You can do this manually, in a text editor, or by selecting the text and hitting the {} button in the toolbar:

    enter image description here

  3. Remember that you can use HTML to format your post. Enclose your code in <pre><code> to invoke the syntax highlighter and format your text as code.

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And this question basically proofs this article:

You indent the code 4 lines and that should work.

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Yep, I kept clicking and clicking {} around my code - but only trying once the 4x indent as suggested, it worked right away. Thanks! – gnB Jul 23 '14 at 18:27
That must be a blog about how disappointing it is that you have to put HTML in a code block. – Jonathan Mee Jan 14 at 12:54

Write your HTML code, select it, and click the "{}" icon on the top of that textarea.

<html><head></head><body>html code</body></html> 
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