- Tags: JS Window
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The window.getComputedStyle() method gets the computed CSS properties and values of an HTML element.
<h2 id="my_heading" style="background-color: red;">My Heading</h2>
<!-- html element to place output -->
<p id="my_output"></p>
The following gets the specified css value from the HTML element with an #id of my_heading, and outputs it to my_output.
// variables
let my_element = document.getElementById('my_heading');
let my_css = window.getComputedStyle(my_element, null);
let my_result = my_css.getPropertyValue('background-color');
// output to HTML my_element
document.getElementById('my_output').innerHTML = my_result;
Output
rgb(255, 0, 0)
Syntax
window.getComputedStyle(element, pseudoElement)
Parameters
| Parameter | Description |
|---|---|
| element | The element to get the computed style for (required) |
| pseudoElement | A pseudo-element to get |
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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