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– If someone clicks on the recommended item it overlays the previous product-detailed page with a new one. -
This is exactly how it should work. There are many possible reasons why a buyer clicks on a recommended product, including seeing that recommendation is better than the product they are currently viewing.
Putting a return button on the article itself ...
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The interaction is based on a model where tab moves between form elements and a radio group is a single "element".
A checkbox is clearly a single element that comprises one choice, while a group of radio buttons is treated like a single element because they all work together to form a similar choice. Tab moves you between each as they represent a ...
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