How Can JavaScript Dynamically Modify CSS Rules?

Modifying CSS Rules with JavaScript

It is possible to dynamically alter CSS rules using JavaScript, allowing for real-time modifications to the appearance of web pages based on user actions. This capability can be useful for scenarios such as adjusting the styling of multiple elements with a common class in response to user input.

One approach to changing CSS rules with JavaScript involves accessing and manipulating the browser's Document Object Model (DOM). By retrieving a reference to the desired CSS rule, you can modify its properties and values.

To achieve this, you can utilize the following steps:

1. Obtain the style sheet by referencing the document.styleSheets property.
2. Access the specific CSS rule using the rules or cssRules property of the style sheet.
3. Modify the properties or values of the rule as required, for instance, by using the style property.

For a comprehensive guide on modifying CSS rules with JavaScript, refer to the article "Totally PWN CSS with Javascript" web archive link. This reference provides detailed instructions on how to implement this technique across different browsers, including Firefox, IE, and Chrome.

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