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How can one define a constant <img> src URL in HTML, so that it can be reused in multiple attributes?
What happens if I use an absolute URL for the <img> src attribute?
If you use an absolute URL for the <img> src attribute, it will override the base URL. So, for example, if your base URL is "http://www.example.com/images/" and you use the following code for your <img> tag:

<img src="http://www.example.com/pictures/cat.jpg">

the image will be loaded from the absolute URL, ignoring the base URL.