rallax.js is a "dead simple" vanilla JavaScript library used to create dynamic parallax scrolling effects on web pages. It is designed for high performance and provides a robust API without requiring heavy dependencies like jQuery.

The main features of this tool include:

• Simple Implementation: The library allows developers to easily apply parallax effects to target HTML elements by simply installing it via NPM and calling a specific function with desired options.

• Precise Speed Control: Users can define the speed of the parallax effect using a float number. A speed of 0 makes the element static, 1 makes it appear fixed, and higher speeds allow the target to move faster than the scroll.

• Mobile-Specific Handling: It includes a mobilePx option that allows developers to automatically disable the parallax effect when the screen width is below a certain pixel threshold.

• Dynamic API Methods: The library provides a set of methods to control the effect programmatically, including stop() and start() to pause or resume the movement, and changeSpeed() to modify the effect on the fly.

• Conditional Effects via "when": A powerful when() method allows developers to queue specific actions—like changing speed or stopping the effect—based on custom conditions such as scroll position or time elapsed.

• Robust Page Refresh Handling: The tool is designed to adapt to page refreshes by automatically placing elements exactly where they should be based on the current scroll position.

• High Compatibility: It is built on the requestAnimationFrame API, supporting modern browsers as well as older ones like IE 10+.

• Open-Source Foundation: The project is written entirely in JavaScript and is distributed under the MIT license.