What is the functionality of intro.js?

Currently, I am utilizing an onboarding tour at my.bonify.de that provides a similar experience to introjs.

The way we have implemented this feature is quite unattractive, using a cutout div with a very large box-shadow. We are looking to enhance it by incorporating an overlay like introjs, as it appears to provide better performance compared to our current method.

After reading this resource, I am confused about how introjs actually functions, especially since the highlighted element should technically be in a lower stacking context.

I have attempted to replicate the behavior of introjs with our own onboarding system, but I am struggling to position the element on the page above the overlay.

I am curious to learn more about how introjs achieves this effect, as I initially thought that this specific code block was the key, however, upon inspection with a debugger, the class is not being added as expected.

javascripthtmlcssintro.js

Answer №1

If you want to layer a relative element on top of a fixed one, simply assign a higher z-index value to the relative element. Use these CSS classes as an example:

.fixed-element {
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  left:0;
  z-index:2;
  background: rgba(0,0,0,0.75);
}
.relative-element {
  position:relative;
  z-index:10;
}

Check out this live demo to see it in action: https://jsfiddle.net/7ergcfvq/1/

Answer №2

Take a look at the first step of the demo in intro.js. In this step, the <h1>Intro.js</h1> element has classes .introjs-relativePosition and .introjs-showElement, giving it a position:relative and a z-index:9999999!important.

Interestingly, the 

<div class="intros-overlay">
only has a z-index of 999999, which is lower than that of the <h1> and 
<div class="introjs-helperLayer">
.

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