Select DOM Elements Using JavaScript CSS Queries

As I delved into JavaScript in an attempt to craft my personal slider, I stumbled upon a perplexing discovery. I encountered a CSS regulation that looked like this:

html.js #slideshow .slides img
{
    position: absolute;
}

The explanation suggested that the regulation would solely come into effect if JavaScript was accessible. Now, I find myself slightly puzzled... Would this dictate be enforced only when JavaScript is functional in the browser? Or does it hinge on "html.js" being integrated into the html page, or any random JavaScript files being included?

I appreciate your assistance beforehand.

javascripthtmlcssslider

Answer №1

One useful method involves utilizing javascript to append the 'js' class to the html tag. Without javascript, the js class is not present. This approach simplifies identifying whether JS functionality is active in CSS.

Answer №2

Perhaps on your page, there is a script in the head section that adds a js class to the root element.

This method ensures that the CSS rule will only be applied if javascript is enabled on the client side. Without javascript, the class will not be added by the script.

It is a modern technique commonly used to prevent the flash of unstyled content (FOUC).

Answer №3

If you came across a webpage that seems to be using Modernizr, it's a JavaScript library designed to detect HTML5 and CSS3 features in the visitor's browser. When the page loads, Modernizr initially adds a class "no-js" to the HTML element and then replaces this with a set of rules for testing purposes.

To explore specific browser features, you can visit the Modernizr website for more information and guidance.

If you prefer not to utilize Modernizr, you can achieve similar effects with plain JavaScript by placing the following code directly within your <title> tag:

<script>
document.documentElement.className = document.documentElement.className.replace(/(\s|^)no-js(\s|$)/, '$1' + 'js' + '$2');
</script>

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