Create an speedyBar element on your template

<div class="speedyWrapper">
  <speedy-bar></speedy-bar>
</div>

put some styling on both elements, example:

.speedyWrapper {
  width: 100%;
  position: fixed;
  top: 0;
}

speedy-bar {
    display: inherit;
    width: 0%;
    background: red;
    height: 3px;
    transition: .5s all;
}

you can customize the color or the width, ANYTHING!.

and put this on your javascript file

const speedyBar = document.getElementsByTagName ("speedy-bar")[0];
// [0] can be [1], [2], etc as you want

You need to set some settings at first use.

just put those line on your javascript file

speedybar.init = {
  times: 3,         //  how many steps do you use 
  duration: 500   //  how long the duration step-to-step (in ms)
};

speedyBar.step();

this is the one-step function for animate the bar from n-1 to n if the bar reaches it max width it'll start from 0, again

speedyObj.goPos(5); // must integer and not higher than times that was set

That's All.