Most websites require users to verify they are human to prevent automated scripting. When you access a login page, your browser is prompted to run JavaScript verification tests to confirm you’re not a bot. The test involves solving a simple math problem or identifying an image.
If the script fails to load due to disabled JavaScript in your browser, the website will request that you enable it and reload the page. This added security measure ensures only genuine users can access the site, protecting against malicious automated scripts used for hacking attempts.
Source: https://www.seattletimes.com/sports/seahawks/seahawks-release-tight-end-noah-fant