It's a security issue if you try to use the CSSRulePlugin without a server in some browsers. Try using one of these for a local dev server.   BrowserSync https://browsersync.io   LiveReload Chrome Extension https://chrome.google.com/webstore/detail/livereload/jnihajbhpnppcggbcgedagnkighmdlei   MAMP https://www.mamp.info/en/
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