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

Usability Testing: what, how and why? - Optimal Workshop

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Designing a user friendly login. To ensure your users experience is…, by Ally Eastman

4 Design Patterns That Violate “Back” Button UX Expectations – 59% of Sites Get It Wrong – Articles – Baymard Institute

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