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that's cool but it doesn't work as validation! it's just for easier handling to select an image from a folder with different extension. as you can see here -> imageshack.us/a/img20/8451/switchzz.jpg
– bernte
Commented May 24, 2013 at 17:36
One defining it in the HTML can be overridden in some browsers by choosing "all files" in the file dialog. Two, even though it in it of itself is not 100% fool proof, validating it with javascript is yet another appended deterrent in the fight against malicious activities. All in all you want to have your backend validate before accepting, and as an added bonus by checking and validating the first few bytes of the file to validate it is a type you really want, since by extension alone is never a fool proof means.
– chris
Commented Jul 9, 2015 at 20:47

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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
for linebreak add 2 spaces at end
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indent code by 4 spaces
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quote by placing > at start of line
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