How to fix flickering from css keyframe animation - html

Question

I am trying to stagger the opacity (fade) of three boxes via an infinite keyframe animation and the animation-delay property.
I am getting some unexpected behavior, as the third box fades away, it suddenly reappears faintly ("flickers") before the animation starts again. I am experiencing this across browsers.
I would like to use pseudo elements if possible, is there a known fix for this keyframe bug?
HTML
<div class="container">
<div class="child">
<div></div>
</div>
</div>
SCSS
.container {
position: fixed;
left: 150px;
top: 50px;
.child {
position: absolute;
animation:mymove 1s infinite;
&::before{
display: block;
position: absolute;
width: 25px;
height: 25px;
background-color: red;
content: "";
right: 40px;
animation: inherit;
animation-delay: .15s;
}
div {
width: 25px;
height: 25px;
background-color: red;
animation: inherit;
animation-delay: .30s;
}
&::after{
display: block;
position: absolute;
width: 25px;
height: 25px;
background-color: red;
content: "";
left: 40px;
bottom: 0px;
animation: inherit;
animation-delay: .45s;
}
}
}
#keyframes mymove {
0% {
opacity: 1;
}
100% {
opacity: 0;
}
}
JS Fiddle

Answer 1

The reason they flicker is because you have set an animation on their parent, the child.
And since its animation doesn't have a delay, it starts before its children, but will then be overridden by them as soon as their delay has passed, hence one can see a quick flash.
The best way to avoid any future issue with this, is to remove the animation from the child
.container {
position: fixed;
left: 150px;
top: 50px;
}
.container .child {
position: absolute;
}
.container .child::before {
display: block;
position: absolute;
width: 25px;
height: 25px;
background-color: red;
content: "";
right: 40px;
animation: mymove 1s infinite;
animation-delay: 0.15s;
}
.container .child div {
width: 25px;
height: 25px;
background-color: red;
animation: mymove 1s infinite;
animation-delay: 0.3s;
}
.container .child::after {
display: block;
position: absolute;
width: 25px;
height: 25px;
background-color: red;
content: "";
left: 40px;
bottom: 0px;
animation: mymove 1s infinite;
animation-delay: 0.45s;
}
#keyframes mymove {
0% {
opacity: 1;
}
100% {
opacity: 0;
}
}
<div class="container">
<div class="child">
<div></div>
</div>
</div>