How Can I Dynamically Style CSS Pseudo-Elements with JavaScript?

Manipulating CSS Pseudo-Element Styles with JavaScript

Changing the styles of CSS pseudo-elements, such as scrollbars, purely through JavaScript can be challenging. While methods like directly accessing the style property of the pseudo-element may not work as expected, there are alternative approaches you can consider.

One effective solution is to utilize CSS variables, which provide a seamless way to modify pseudo-element styles from JavaScript. By introducing CSS variables in your CSS code, you can define a fallback value and then dynamically update it in your JavaScript code.

For instance, to change the color of the scrollbar, you can define the following CSS:

#editor {
  --scrollbar-background: #ccc;
}

#editor::-webkit-scrollbar-thumb:vertical {
  /* Fallback */
  background-color: #ccc;
  /* Dynamic value */
  background-color: var(--scrollbar-background);
}

In your JavaScript, you can then manipulate the CSS variable using the setProperty() method:

document.getElementById("#editor").style.setProperty('--scrollbar-background', localStorage.getItem("Color"));

This approach provides support for most modern browsers, including Chrome, Firefox, and Safari. It allows you to dynamically update pseudo-element styles, enabling you to implement custom scrollbar customization and other desired effects.

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