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 |
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)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.