Fenced Code Blocks

Fenced code blocks are defined in Markdown by surrounding the code fragment with a matching pair of at least three consecutive backtick characters or tildes. For example, the following creates a code block with backticks:

```
<script>
  alert('Hello, world!')
</script>
```

And the following creates a code block with tidles:

~~~
<script>
  alert('Hello, world!')
</script>
~~~

A language may optionally be specified for the code block. The language is specified after the opening backticks or tildes, for example:

```javascript
<script>
  alert('Hello, world!')
</script>
```

Things to watch out for:

• Backticks and tildes cannot be mixed. A code block that opens with backticks must also close with backticks. Similarly, a code block that opens with tildes must conclude with tildes.