Validation in Slide Outs (desktop)

I have slide out with a bunch of filters.(sorry, because of private info I can’t publish them) I can apply 1, 2 or 5 filters by clicking “Apply Filters”.
By clicking on filter I can get to its settings (another slide out). To apply chan…
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How to consolidate two web platforms with slightly different IA?

I need to consolidate two web products that have some similarities and many differences in labels and groupings. For round 1 testing, I plan to do open card sorting with content from both sites. I would test product 1 users, product 2 use…
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Informative mobile scrolling by tag or category

A designer came to one of our iOS engineers to show us some inspirations she saw with some iOS apps where they allow users to scroll by tag or category Some examples include Snapchat where if you go to your Stories list and to the right yo…
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What is the benefit of 2 drive thru lanes at a fast food restaurant?

The following photo shows the drive thru lane at a fast food restaurant. The lane splits in two to allow 2 drivers to place their order at the same time.
The following photo shows an overhead view of the restaurant:
As you can see, …
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Why don’t <button> HTML elements have a CSS cursor pointer by default?

A friend was asking me why <button> HTML elements don’t have a CSS cursor pointer by default?
It is the default behavior for links, and can be achieved on a button with
button { cursor:pointer; }
Still, why this difference? Sou…
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Should you always confirm sign-out in a mobile app?

Is this necessary as it’s not a critical action but I see it in a few apps. If so, what are the reasons behind it?
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What’s the recommended max width for the main container and for the main column, for large screens?

Based on this question, “Why do many sites leave half of each webpage empty?” and its comments and answers, I did some research, but I didn’t find a complete answer.
For me it is obvious that it is a good decision to limit the width of t…
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Fixed width for buttons or proportional with the text?

What is the best practice for a UI, to make all the similar buttons with a fixed-width, no matter how long is the text (with the condition to fit) or make the width proportional with the text and add the same padding?
Update:
Please check…
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Form navigation mental model

If an user comes from Windows based software, where in forms you navigate through the inputs with enter key and save by ctrl+s, to browser based software where the default navigation is done with the tab key and save with enter, what can I…
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Is it a "Natural language" form a good practice?

A good UX for a form is one that makes it easy and fast to use.
An experimental form like this, that uses natural language instead of the usual form display seems to be simple to use and creative, but is this enough intuitive?
Update:
Af…