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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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default
setAttribute, which is not recommended) should just be present or being set to either an empty string or itself (defer="defer", especially important when writing XHTML compliant documents); when setting the element's property on-the-fly using JavaScript, one should uses.async = true.true; eitherasync,async=""orasync="async".async="true". It's not the correct way to do it now, but it was the only widely supported way to do it then. For example IE10p2 supportedasync="true"but did not supportasync="async"