How can I dynamically change the width of a :before pseudo-element using jQuery?

Dynamic Width Modification of :before CSS Selectors with JQuery

In web development, you may encounter scenarios where dynamic content requires adjustments to the styling of pseudo-elements like :before. To achieve this with JQuery, a popular javascript library, follow these steps:

Firstly, assume the following CSS rules:

.column:before{
    width: 300px;
    float: left;
    content: "";
    height: 430px;
}

.column{
    width: 500px;
    float: right;
    padding: 5px;
    overflow: hidden;
    text-align: justify;
}

Now, to set the width property of the :before pseudo-element using JQuery, you can append a new style element to the document's head:

$('head').append('<style>.column:before{width:800px !important;}</style>');

This adds a new CSS rule that overrides the initial width設定。重要提示是使用 "!important" 来确保新规则优先於现有规则。

For a live demonstration, refer to this URL: [Live Demo Link]

While this method is not specific to :before pseudo-elements, it allows you to dynamically modify their width or other CSS properties.

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