Visual Testing (VT) Practice Exam 2026 - Free VT Exam Practice Questions and Study Guide

CSS, or Cascading Style Sheets, plays a fundamental role in Visual Testing because it determines the visual styles of web elements. In the context of visual testing, the primary focus is on accurately rendering the graphical layout and appearance of a web application. This includes aspects such as colors, fonts, spacing, borders, and overall aesthetic arrangement of elements on the page.

By defining these visual styles, CSS directly influences how users perceive and interact with a web application. When conducting visual testing, it is crucial to ensure that the rendered output matches the expected visual design based on the CSS specifications. This ensures a consistent user experience across different devices and browsers.

The other options relate to different aspects of web development or testing: while layout is indeed influenced by CSS, it is not the sole function of CSS, as layout can also involve HTML structure. User interactions are managed through JavaScript rather than CSS. Performance optimization may involve techniques like minimizing file sizes or using efficient loading strategies, which is not directly controlled by CSS itself. Therefore, understanding the distinct role of CSS in terms of visual styling is essential for effective visual testing.