Which technology is best suited for creating responsive Web pages compatible with various devices?

The most suitable technology for creating responsive web pages compatible with various devices is CSS3. CSS3 includes features like media queries, flexible grid layouts, and responsive units that allow web developers to tailor the appearance of a web page based on the size and capabilities of the user's device. With media queries, for example, you can apply different styling rules to different screen sizes, enabling content to adjust dynamically whether viewed on a mobile phone, tablet, or desktop computer.

While HTML5 APIs offer powerful functionalities for improving user experiences and enhancing web applications, they do not specifically address the layout and design aspects crucial for responsiveness. HTML4 is outdated and lacks many modern capabilities, such as those found in CSS3 for responsive design. JavaScript can enhance interactivity on a page but does not inherently provide the layout capabilities necessary for creating responsive designs. Thus, CSS3 stands out as the primary technology for achieving responsive web design, allowing developers to ensure a seamless experience across a range of devices.