JSFiddle - React, Tailwind, and code Playground

HTML

<div class="some-class">text</div>

CSS

.some-class {
    border: 1px solid green;
}            
#some-id {
    width: 40px;
}

JavaScript

Array.prototype.forEach.call( document.styleSheets, function( CSSStyleSheet ) {
    
    var rules = CSSStyleSheet.cssRules ? CSSStyleSheet.cssRules : CSSStyleSheet.rules;
    
    Array.prototype.forEach.call( rules, function( CSSStyleRule ) {
        
        console.log( CSSStyleRule.cssText );
        console.log( CSSStyleRule.selectorText );   
        console.log( CSSStyleRule.style.cssText );
        
    });
    
});