GitHub spoiler markdown.md

Demo:

Spoiler warning

Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the <details> tag... just make sure you close <details> afterward.

console.log("I'm a code block!");

How to:

<details>
  <summary>Spoiler warning</summary>
  
  Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the `<details>` tag... just make sure you close `<details>` afterward.
  
  ```javascript
  console.log("I'm a code block!");
  ```
  
</details>

Credits:

dear-github/dear-github#166

If you combine the spoiler tag with quoting, then when expanded the vertical quote bar makes it is easier to see what can be collapsed

<details><summary></summary>

> whatever markdown....
> ``` SQL
> SELECT sqrt(sqrt(2143.0/22))
> ``` 
> blah blah....

</details>

blah blah after the collapsable section

renders like

whatever markdown....

SELECT sqrt(sqrt(2143.0/22))

blah blah....

blah blah after the collapsable section