How to add a collapsible section in markdown.

markdown-details-collapsible.md

How to

<details>
  <summary>Click me</summary>
  
  ### Heading
  1. Foo
  2. Bar
     * Baz
     * Qux

  ### Some Code
  ```js
  function logSomething(something) {
    console.log('Something', something);
  }
  ```
</details>

Example

Click me

Heading

1. Foo
2. Bar
   • Baz
   • Qux

Some Code

function logSomething(something) {
  console.log('Something', something);
}

Rules

1. Have an empty line after the </summary> tag or markdown/code blocks will not render.
2. Have an empty line after each </details> tag if you have multiple collapsible sections.