What is this called in GUI? A "panel" that contains tabs

I have a feeling this answer will depend on everyone’s opinions and which design spec they follow. However, maybe it will give me a broader perspective.
I have a “panel” (as best as I can describe). It so happens to contain tabs in this i…
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Should someone be able to log out without an internet connection?

Facebook and other apps allow you to log out without an active internet connection. We have to make the decision to allow this or not, but I think that you should ask for an internet connection to log out. This is mostly because the server…
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Formula for color contrast between text and background

In my Android app a user can choose the color of an item. This color is then shown in background with a text on it. I want to display the text either in black or white – depending on the background color.
Is there a formula to calculate …
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How to display a date filter consisting of custom date selector and buttons

I am building an iOS application which contains a list of videos, these videos can be filtered by date. I am looking for a better way to display these filters on Mobile, with such a limited screen space.
The User can select a custom start…
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In-page actions in an enterprise with general Save button

we are building an enterprise where the user can register/edit customers. Each customer has a lot of information which is separated in multiple tabs (up to 10).
The enterprise has a general save/create button – the user can edit fields …
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Limit my app usage to increase the download greed among users?

Not limiting the whole app as such but the most important feature.
For example if I have 3 options x,y and z and Z being the most important, I could limit it’s usage ? Like limiting option z to 1 time a day ? or 6 times a week?
Will this m…
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What is the reason for having more than one login link for Facebook?

If you do a Google search for facebook you’ll see something that I think is rather curious, basically there are two different links, one to log into your account and the other to login to your account.
The Log in to Facebook link has th…
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Is it beneficial for users to be able to change the display location of user and system notifications?

Some back story. I’m working on a data science platform, and sometimes when working with Jupyter, RStudio, H20, etc, displaying notifications works for one type of notebook but not the other.
Because each of these products has it’s own se…
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Form that contains select / multiselect field with possibility to add new element with its details to those fields

I have a problem with finding the best approach for forms that contain deeper relationships.
For example I have a form for creating an invoice. While the user is filling particular fields he may have to chose a client that is going to ge…
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How can a user recover a mistyped email account?

I have a website where users login with their email address and password.
They also can update their account details like first and last name, location and email address. If they make a typo while updating their email, what’s the best way …