usability - What is the significance of the Sign Up button on

So Facebook updated their login page. I couldn't help but wonder the reason behind having a Sign Up button in the header when there already is a Sign Up form in the body section. What aspect of UX

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Drop-Down Usability: When You Should (and Shouldn't) Use Them – Articles – Baymard Institute

5 Registration Form Usability Guidelines - Usability Geek

The State Of Usability In 2023 - That's how people behave on the web. Some observations from real usability testing on what people do and what they don't do on the web.

What is Ease of Use? — updated 2023

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Help! My Boss Doesn't Think Usability Testing is Worth It