Giving AI Agents a Better Way to Debug CSS

Have you ever written a CSS rule, only to find out that it doesn’t seem to have any effect on the element you’re trying to style? You inspect the stylesheet, find the declaration, and everything looks perfectly fine. But the browser has other plans. This usually happens because of how the CSS cascade works. A declaration might be overridden by another rule, lose because of specificity, or be affected by things like cascade layers, media queries, or inheritance. And figuring out which rule is actually taking effect can sometimes be a bit of a detective job. Now, imagine being able to ask an AI coding assistant to investigate this directly in the browser instead of having it guess by reading your CSS files. That’s exactly what Chrome DevTools MCP makes possible. In this article, I’ll show you how to connect Chrome DevTools MCP with Codex and use its new get_css_styles tool to inspect the actual CSS rules applied to an element, understand why certain declarations are overridden, and…

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