Which is a key feature of most web-browser pop-up blockers?

Most web-browser pop-up blockers primarily function to enhance user experience by preventing unwanted pop-up windows that can be intrusive and disruptive. One of the key features of these blockers is their ability to block pop-ups created by JavaScript, a common method used by websites to generate pop-up ads or additional content.

JavaScript is often utilized in web development to create dynamic interactions on websites, and it frequently triggers pop-up windows for advertisements or notifications. By targeting and blocking these JavaScript-generated pop-ups, the blocker helps users browse more comfortably without unnecessary interruptions. This capability is integral to the effectiveness of pop-up blockers, as it ensures that only genuine content and navigational elements are displayed, streamlining the browsing experience while enhancing security by reducing exposure to potentially malicious pop-ups.

The other options do not accurately describe the primary function of pop-up blockers—eliminating all web traffic goes beyond the intended function, enhancing browser graphics is unrelated to the blocking feature, and requiring user subscriptions is not a common practice associated with standard pop-up blockers, which are typically included as part of the browser's built-in features.