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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)
``` - put returns between paragraphs
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lang-html
:activeworks while the mouse is down. Depending on what you're trying to do, you may be able to make it work using the CSS4 pseudo-class:target.:targetis not new to Selectors 4. It has been available since Selectors 3, which was already a recommendation for a year at the time of writing.