how to connect a css file to a js file code example

Example 1: append css file with javascript

var cssFile = document.createElement('link');
    cssLink1.rel = 'stylesheet';
    cssLink1.href = "styles.css";  // or path for file {themes('/styles/mobile.css')}
    document.head.appendChild(cssFile); // append css to head element

Example 2: js add css to document

document.querySelector('head').innerHTML += '<link rel="stylesheet" href="styles.css" type="text/css"/>';

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Html Example