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shshaw/index.html

Created November 5, 2020 16:49
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One-Element Hourglass ⏳
Raw
index.html
<div class="hourglass"></div>
Raw
one-element-hourglass.markdown

One-Element Hourglass ⏳

A hourglass preloader created using only one element. clip-path is the key property here.

A Pen by Jon Kantner on CodePen.

License.

Raw
style.css
* {
border: 0;
box-sizing: border-box;
margin: 0;
padding: 0;
}
:root {
--bg: #e3e4e8;
--fg: #2e3138;
--primary: #255ff4;
font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body {
background: var(--bg);
display: grid;
font: 1em/1.5 sans-serif;
height: 100vh;
place-items: center;
}
.hourglass, .hourglass:before, .hourglass:after {
animation-duration: 4s;
animation-iteration-count: infinite;
}
.hourglass {
--polygonH: polygon(0% 0%,100% 0%,100% 5.55%,95% 5.55%,95% 28%,60% 46%,60% 54%,95% 72%,95% 94.45%,100% 94.45%,100% 100%,0% 100%,0% 94.45%,5% 94.45%,5% 72%,40% 54%,40% 46%,5% 28%,5% 5.55%,0% 5.55%);
animation-name: flip;
animation-timing-function: ease-in-out;
background-image: linear-gradient(var(--primary) 0.5em,#737a8c55 0.5em 8.5em,var(--primary) 8.5em);
clip-path: var(--polygonH);
-webkit-clip-path: var(--polygonH);
overflow: hidden;
position: relative;
width: 5em;
height: 9em;
z-index: 0;
}
.hourglass:before, .hourglass:after {
animation-timing-function: linear;
content: "";
display: block;
position: absolute;
}
.hourglass:before {
--polygonB1: polygon(0% 0%,100% 0%,100% 24%,50% 47%,50% 47%,50% 47%,50% 47%,50% 47%,50% 47%,50% 47%,50% 47%,0% 24%);
--polygonB2: polygon(0% 4%,100% 4%,100% 24%,55% 45%,55% 100%,55% 100%,55% 100%,45% 100%,45% 100%,45% 100%,45% 45%,0% 24%);
--polygonB3: polygon(0% 24%,100% 24%,100% 24%,55% 45%,55% 80%,100% 100%,100% 100%,0% 100%,0% 100%,45% 80%,45% 45%,0% 24%);
--polygonB4: polygon(45% 45%,55% 45%,55% 45%,55% 45%,55% 58%,100% 76%,100% 100%,0% 100%,0% 76%,45% 58%,45% 45%,45% 45%);
--polygonB5: polygon(50% 53%,50% 53%,50% 53%,50% 53%,50% 53%,100% 76%,100% 100%,0% 100%,0% 76%,50% 53%,50% 53%,50% 53%);
animation-name: fill;
background-color: var(--fg);
background-size: 100% 3.6em;
clip-path: var(--polygonB1);
-webkit-clip-path: var(--polygonB1);
top: 0.5em;
left: 0.5em;
width: 4em;
height: 8em;
z-index: 1;
}
.hourglass:after {
animation-name: glare;
background:
linear-gradient(90deg,#0000 0.5em,#0003 0.5em 1.5em,#0000 1.5em 3.5em,#fff3 3.5em 4.5em,#fff0 4.5em 6.5em,#0003 6.5em 7.5em,#0000 7.5em) 0 0 / 100% 0.5em,
linear-gradient(90deg,#0000 0.75em,#0003 0.75em 1.25em,#0000 1.25em 3.75em,#fff3 3.75em 4.25em,#fff0 4.25em 6.75em,#0003 6.75em 7.25em,#0000 7.25em) 0 0.5em / 100% 8em,
linear-gradient(90deg,#0000 0.5em,#0003 0.5em 1.5em,#0000 1.5em 3.5em,#fff3 3.5em 4.5em,#fff0 4.5em 6.5em,#0003 6.5em 7.5em,#0000 7.5em) 0 100% / 100% 0.5em;
background-repeat: repeat-x;
top: 0;
left: -3em;
width: 200%;
height: 100%;
z-index: 2;
}
/* Animations */
@keyframes fill {
from {
clip-path: var(--polygonB1);
-webkit-clip-path: var(--polygonB1);
}
10% {
clip-path: var(--polygonB2);
-webkit-clip-path: var(--polygonB2);
}
45% {
clip-path: var(--polygonB3);
-webkit-clip-path: var(--polygonB3);
}
80% {
clip-path: var(--polygonB4);
-webkit-clip-path: var(--polygonB4);
}
85%, to {
clip-path: var(--polygonB5);
-webkit-clip-path: var(--polygonB5);
}
}
@keyframes glare {
from, 90% {
transform: translateX(0);
}
to {
transform: translateX(3em);
}
}
@keyframes flip {
from, 90% {
transform: rotate(0);
}
to {
transform: rotate(180deg);
}
}
/* Dark mode */
@media (prefers-color-scheme: dark) {
:root {
--bg: #17181c;
--fg: #c7cad1;
}
}
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