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Rev

Thanks @Bear GRiZZLY Xi almost exactly as I want. The script works nicely scrolling down but not on the way back up? Also noticed a typo (full stop) at the end of .addClass('active') & I was also going to ask about a animate or transition when the class changes.
– Kerry7777
Commented Dec 7, 2015 at 21:50

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Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

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
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>

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