How Can I Dynamically Style CSS Pseudo-Elements in WebKit Using JavaScript?

Dynamic CSS Pseudo-Element Styling via JavaScript in WebKit

Modifying the styles of CSS pseudo-elements dynamically through JavaScript has been a common challenge for developers. In webkit browsers specifically, attempts to manipulate properties like background and visibility often return null errors.

One workaround involves utilizing CSS Variables, which provide a more modern and versatile approach. By defining a variable in your CSS, you can subsequently manipulate its value in JavaScript and apply it to your pseudo-elements.

In your CSS, declare a CSS variable like so:

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

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

Then, in your JavaScript, adjust the --scrollbar-background variable on the #editor element to dynamically change the scrollbar's appearance:

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

This method effectively addresses the limitations of direct style manipulation for pseudo-elements in webkit browsers, while also providing seamless interoperability with older browsers that do not support CSS Variables.

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