Alex Carter

1. Core Pain Point in Frontend Learning: The Cognitive Gap Between Code and Preview HTML and CSS are essentially used to build webpage structures and design visual styles. The real challenge for beginners is never memorizing various tags, but building a two-way connection between code and rendered visuals: being able to picture the exact webpage layout just by reading a piece of code, and locating the corresponding code instantly when seeing any element on a page. Common learning tools like online editors and local IDEs only serve two separate needs: coding and previewing. They fail to bridge the two together. A line of code you select will not trigger any highlight on the preview page, nor will clicking a webpage component jump to its source code in the editor. This disconnection traps new developers in an inefficient cycle of constant revision and repeated refreshing. Over 90% of beginners get stuck not because they cannot understand syntax, but because they fail to match on-page ele...