What are all the differences between src and data-src attributes?

The attributes src and data-src have nothing in common, except that they are both allowed by HTML5 CR and they both contain the letters src. Everything else is different.

The src attribute is defined in HTML specs, and it has a functional meaning.

The data-src attribute is just one of the infinite set of data-* attributes, which have no defined meaning but can be used to include invisible data in an element, for use in scripting (or styling).

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