How Can I Inspect the CSS Inheritance Tree Using Pure JavaScript?

Inspecting CSS Inheritance Tree in JavaScript

In web development, it's essential to understand how CSS rules are applied to elements on a webpage. While browser tools provide insights into this inheritance tree, can we replicate this analysis using pure JavaScript?

The Need for Reproducing CSS Inheritance

Browsers compile CSS rules from various sources and apply them to elements. This results in a comprehensive cascade that defines the appearance and layout of each element. Inspecting this inheritance tree can be crucial for understanding the visual behavior of a webpage.

Solution in Pure JavaScript

Implementing this feature in pure JavaScript without plugins poses a technical challenge. However, here's a cross-browser compatible solution that offers a reasonable approximation:

This function accepts an element as input and returns an array containing the CSS rules that apply to that element. Each element in the array represents a specific rule.

Usage Example

To demonstrate the function, consider the following HTML and CSS:

In this example, the element with the id "description" has two CSS rules applied: a red color and a font size of 20px. Calling css(document.getElementById('description')) will return an array with the two CSS rule strings.

Further Analysis

For more detailed information about each rule, you can explore the CSSRule object documentation.

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