# Pure markdown h1

## h2

### h3

#### h4

##### h5

###### h6

hello 
world

two blank  
line break

    4 space = indent

italic *em*

bold **strong**

italic and bold ***em strong***

escape: \\ \. \| \# \! \* \+ \- \_ \( \{ \[ \< \``

---

***

___

- unordered ul
- list li
    - indented
- list

1. ordered ol
2. list li
    1. indented
4. list

1. mixed
    - ul
2. ol

> block quote
>
> blockquote
>
> > indented
>
> blockquote

[Link a](https://example.com)

<https://example.com>

![img](https://place-hold.it/100x100)

![img alt](https://place-hold.it/100x100 "title")

inline `code`

plain code block
\ . | # ! * + - _ ( ) { } [ ] < > ''

```
plain code block
\ . | # ! * + - _ ( ) { } [ ] < > ''
```

print("python")

```python
print("python")
```

https://www.example.com

strikethrough ~~del~~

highlight ==mark==

~sub~ script

^sup^er script

- [ ] checked box ul li
- [x] input type="checkbox" checked disabled

### heading with id {#extened}

|ttt|aaa|bbb|lll|
|---|:--|:-:|--:|
|.|l|c|r|

dl
: definition list

dt
: definition
: data

foot[^1] note[^note] sup a

[^1]: first foot note

[^note]: long

<!-- comment -->

<br>

<b>html b tag</b>

<details>
<summary>details and summary</summary>
open

and

close

paragraph
</details>

<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/jNQXAC9IVRw" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>