What is the purpose of testing a website for cross-browser compatibility?

The purpose of testing a website for cross-browser compatibility is to ensure that the website functions properly across different web browsers and devices. This is essential because various browsers (like Chrome, Firefox, Safari, and Edge) and devices (such as smartphones, tablets, and desktops) interpret and render web pages differently. Cross-browser compatibility testing checks that all users have a consistent experience, regardless of the platform they are using.

This involves verifying that all features, designs, and functionalities work as intended in multiple environments, minimizing the chances of users encountering issues while navigating the site. A website that is not cross-browser compatible may present bugs, layout issues, or even broken links to users, leading to frustration and potentially reducing traffic and engagement.

In contrast, the other options focus on aspects that, while important, do not directly address the functionality and consistency of a website across various browsers. SEO optimization, aesthetics, and loading speed are critical factors in web development, but they do not specifically relate to the ability of the website to operate correctly within different browsers.