The Interactive Image block is meant to give designers the option of showing of a second image which is hidden until triggered by a mouseover events. You add the two images by selecting bot a "Base Image" and a "Hover Image" which will replace the "Base Image" on mouseover events. A couple of scenarios where this can be a neat addition to your guideline could be;
When you want to show off small changes to a logo or icon to highlight differences.
Do's and don'ts as defined in the guideline.
From sketch to final design.
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