Developer builds CSS Radar tool to detect JavaScript replaceable by modern CSS

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A developer has created a free tool called CSS Radar that scans public web pages to identify JavaScript patterns that could be replaced by native HTML or modern CSS features. The scanner renders pages in Chromium, scrolls through content, and tests interactions to collect real evidence before flagging any findings, minimising false positives. Common patterns it detects include custom modal focus traps, class-toggled dropdown menus, and IntersectionObserver-based reveal animations — all of which have modern CSS or HTML equivalents. The tool deliberately takes a conservative approach, only reporting a finding when multiple pieces of captured evidence confirm a verifiable replacement exists. CSS Radar is aimed at developers who want practical, site-specific guidance rather than generic advice about adopting newer browser capabilities.

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