Building Single-File Calculators and Comparison Tools for WordPress (No Plugin, No Framework)

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I run UniversalNest, a WordPress publication. Most of what we publish is articles, but some topics are better served by a small interactive tool: a calculator or a side-by-side comparison. I've built a few, and I settled on one pattern that I now reuse: one self-contained HTML file, no framework, no build step, no plugin. Here is why I chose it and where it breaks down. A plugin is the "correct" answer, but for a single tool it carries a lot of overhead: Plugin updates and compatibility checks for something that renders one widget A PHP layer for logic that is really just client-side math Extr

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