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Created Detecting changes in images (markdown)

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At the moment, changedetection.io only supports detecting changes in the Text of the webpage, however, you can also use the `source:` keyword in the URL to tell changedetection to return the HTML source.
So this means that you could use changedetection to detect when the HTML now references a different image source.
For example
The source at https://example.com is
```
<HTML>
<BODY>
<div id="wrapper">
<img src="november-calendar.jpg">
</div>
<div id="other stuff">
our new calendar!
</div>
</BODY>
</HTML>
```
By specifying `source:https://example.com` and a filter of `#wrapper`, you will get a notification when the website changes "november-calendar.jpg" to "december-calendar.jpg"