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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
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lang-js
if (window.matchMedia('(max-device-width: 960px)').matches) { var winW = (window.innerWidth > 0) ? window.innerWidth : screen.width; } else { var winW = screen.width; }var isMobile = window.matchMedia && window.matchMedia('(max-device-width: 960px)').matches || screen.width <= 960;matchMedia()there is a polyfill: github.com/paulirish/matchMedia.js