Know that this will work on any pseudo class and not only :hover. Your email address will not be published.

Employer planning on making a change that I'm prepared to quit over. Change text highlight color in JavaScript. The first step is to select the element you want to apply or change a style on.

The first line of Javascript below gets all the styles of document.documentElement (the way to reference :root) and assigns the result to the Javascript variable, styles. Next I added an event listener to colorInput, which will listen for any change to the color input and then run a function. If you want to get a CSS property that was computed from a style-sheet in pure JavaScript then you need to use. I think your first code block is missing the content? That way you are keeping the correct separation between behaviour and style. None of this is necessary, but I think it makes for a more presentable example. If the CSS property has dashes (‐), the CSS property name gets converted to camelCase. I also added another type of input (the range input) to the demo to allow you to control the font-size of some text I added inside the div. This is important to note, and understand because the way you write your code can affect your dynamics. The variable colorValue should now hold a value of red, which is the value I initially set on –color in the CSS.

Here I created an empty div and an input with a type of color so users can access their default color picker.

Again, I’ll keep the example as simple as possible for the sake of explanation. The code is very similar to how I changed the background color here. Here are three examples that use sliders and color pickers to alter the values of custom properties.

Home / Blog / CSS / CSS Custom Properties—Dynamic Changes With And Without Javascript. Most of the time you’ll want to set a value, but leaving it out is a way to change the custom property to an empty string. Though, to be fair, I only discovered the `.setProperty()` method yesterday Anyway, good write-up. Do extremely high-voltage power lines emit positrons?

The first two are necessary as they identify the property to change and the new value it will be assigned. Next week I want to wrap up this series showing you how to combine custom properties with transforms, transitions, and keyframe animation. Together they founded WatzThis?, a company focused on training and course development. What can we do? I gave the div a width and height and using the var() function set its background color to the value of the –background custom property. Have you ever wished you could change the value of a Sass or Less variable after your page has loaded? To set a new value on a custom property you use the style.setProperty method. What's the word for asking someone to deliver their promise?

For example, background-color becomes backgroundColor, the border-radius property transforms into borderRadius, and so on. your coworkers to find and share information. It is important to understand that the code bellow does not change the stylesheet, but instead changes the DOM: The DOM stores a computed value of the stylesheet element properties, and when you dynamically change an elements style using Javascript you are changing the DOM. @Sime - My quotes aren't inconsistent. While most of the dynamic magic will require a little bit of Javascript, let’s start with a simple example and change the value of a custom property on :hover.

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