How Can You Dynamically Manipulate CSS Pseudo-Elements with JavaScript?

Manipulating CSS Pseudo-Elements with JavaScript

Dynamically altering CSS pseudo-element styles using JavaScript can be achieved by employing various techniques, including CSS variables and vendor-specific properties.

CSS Variables

For webkit browsers, a simple and cross-browser-compatible solution for manipulating pseudo-elements is CSS variables. These variables allow you to define styles in CSS and access and change them in JavaScript. To apply this method:

• Define a CSS variable in the style sheet, such as:

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

• In the pseudo-element style, reference this variable using var(--scrollbar-background). For example:

#editor::-webkit-scrollbar-thumb:vertical {
  background-color: var(--scrollbar-background);
}

• To change the pseudo-element's style dynamically, modify the CSS variable's value in JavaScript:

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

Vendor-Specific Properties

To directly target vendor-specific pseudo-elements, such as the WebKit scrollbar, you can use the corresponding vendor prefix in JavaScript. For instance, the following code sets the scrollbar thumb's background color:

document.querySelector("#editor::-webkit-scrollbar-thumb:vertical").style.backgroundColor = localStorage.getItem("Color");

To hide the scrollbar, use the vendor-specific property -webkit-overflow-scrolling:

document.querySelector("#editor::-webkit-scrollbar").style.webkitOverflowScrolling = "hidden";

Note: Browser support for these vendor-specific properties may vary. It is recommended to check the compatibility matrix before using these techniques in production code.

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