CSS: Computed Style

What is Computed Style?

A computed style is all the styles that applies to the element, even if there is no CSS specified for that element.

For example, consider the color of a element, the element itself may not have a CSS color spec, but it inherit styles from parent element, or from browser's initial value for that property.

Find Computed Style by Browser Console

Use browser's web dev tool to find computed style of a element.

[see How to Use Browser Console]

Get Computed Style by JavaScript

Use

window.getComputedStyle(node).getPropertyValue(propName)

/* [
xah_get_computed_style (node, propName)
return computed property value of string propName of element node
version 2019-06-10
 ] */
const xah_get_computed_style = ((node, propName) => window.getComputedStyle(node). getPropertyValue( propName ) );

// --------------------------------------------------
// test

const firstPara = document.getElementsByTagName ('p')[0];

const prop = "color";

console.log( xah_get_computed_style(firstPara, prop) );