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Using <details> <summary> expandable content on GitHub with Markdown #details #summary #markdown #gfm #html

How to use <details> <summary> expandable content on GitHub with Markdown

Firstly, what is <details> <summary>?

The HTML Details Element (<details>) creates a disclosure widget in which information is visible only when the widget is toggled into an "open" state. A summary or label can be provided using the <summary> element. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details.

Example

Toggle me!Peek a boo!
<details><summary>Toggle me!</summary>Peek a boo!</details>

Is there a special GFM (GitHub Flavoured Markdown) syntax for using <details> <summary> on GitHub?
Answer: No, but you don't need it, since GFM allows embedding HTML inside Markdown.

Example

Shopping list
  • Vegetables
  • Fruits
  • Fish

Code

#### Example

<details open>
<summary>Shopping list</summary>

* Vegetables
* Fruits
* Fish

</details>

Remember that blank lines are needed before/after a section of markdown that is within an html tag, otherwise the markdown won't work

More about details/summary

Browser support is good https://caniuse.com/#feat=details It falls back to being expanded all the time. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details

Similar gist https://gist.github.com/ericclemmons/b146fe5da72ca1f706b2ef72a20ac39d

@auwsom
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auwsom commented Sep 29, 2022

Is there a way to toggle the content in side toggle? like:

<details>
<summary>head 1</summary>

    <details>
    <summary>head 1.1</summary>
    content
    </details>

</details>

For nested you need to use blockquote to get the indent:
https://gist.github.com/pierrejoubert73/902cc94d79424356a8d20be2b382e1ab?permalink_comment_id=4319884#gistcomment-4319884

Hello
World - click me to open
😄
  • item1
  • item2
  • item3
World
😄

You only need one blank line above the markdown.
I'm trying to find a tool that converts nested lists in markdown to HTML details and blockquotes.

@mtbeek32
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Is there a way to remove the blank line between World - click me to open and World?

@DeltaPavonis
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@gavinhungry Oddly, this isn't working for me when I use it in VSCode (the summary still ends up on the line below), and I'm not sure why. I was wondering if you happened to know of any extensions or other workaround that might achieve the same?

@DeltaPavonis
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DeltaPavonis commented Jan 27, 2023

Actually, I found a (rather heavy-handed) workaround to get MD-like formatting in <summary>, from a comment in the other gist linked in the post (link)

Just use HTML tags instead of Markdown to get the formatting you want:

Some bold text code.go link
```go
func main() {}
```

Code for the above dropdown was

<details><summary><s>Some</s> <b>bold</b> <i>text</i> <code>code.go</code> <a href="//example.com">link</a></summary>

    ```go
    func main() {}
    ```
</details>

Hope there's a simpler way, whether code-based or extension-based... I haven't found any extensions on VSCode that allow for the same.

@gavinhungry
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@DeltaPavonis,

Good workaround. Sorry that I can't help with anything VS Code specific, I was really only concerned with formatting on GitHub.

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