add css to js code example

Example 1: how to give css style in javascript

document.getElementById("myH1").style.color = "red";

Example 2: add css in javascript

document.getElementById("demo").style.display = "none";

Example 3: add css style sheet with javascript

<head>

<script>
function myFunction() {
  var x = document.createElement("LINK");
  x.setAttribute("rel", "stylesheet");
  x.setAttribute("type", "text/css");
  x.setAttribute("href", "styles.css");
  document.head.appendChild(x);
}
myFunction()
</script>

</head>

Example 4: 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 5: js add css to document

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

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Css Example

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