Inject CSS

JavaScript, Browser, CSS · Oct 22, 2020

Injects the given CSS code into the current document

  • Use Document.createElement() to create a new style element and set its type to text/css.
  • Use Element.innerText to set the value to the given CSS string.
  • Use Document.head and Element.appendChild() to append the new element to the document head.
  • Return the newly created style element.
const injectCSS = css => {
  let el = document.createElement('style');
  el.type = 'text/css';
  el.innerText = css;
  return el;
injectCSS('body { background-color: #000 }');
// '<style type="text/css">body { background-color: #000 }</style>'

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