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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Gradients</title>
<style>
div {
border: 1px solid black;
margin: 20px;
}
.box {
width: 200px;
height: 200px;
}
.rect {
width: 400px;
height: 225px;
}
.grad-0 {
background-image: linear-gradient(to top, red, yellow);
}
.grad-1 {
background-image: linear-gradient(to bottom, red, yellow);
}
.grad-2 {
background-image: linear-gradient(to left, red, yellow);
}
.grad-3 {
background-image: linear-gradient(to right, red, yellow);
}
.grad-4 {
background-image: linear-gradient(to top, rgba(255,0,0,.8), rgba(255,0,0,0) 70.71%),
linear-gradient(to bottom, rgba(0,255,0,.8), rgba(0,255,0,0) 70.71%),
linear-gradient(to left, rgba(0,0,255,.8), rgba(0,0,255,0) 70.71%);
}
.grad-5 {
background-image: linear-gradient(to top, blue, 30%, orange, 10%, red);
}
.grad-6 {
background-image: linear-gradient(to top, blue 30%, 30%, orange 20%, 10%, red);
}
.grad-7 {
width: 400px;
height: 225px;
background-image: linear-gradient(to right, red 0%, black 20%, yellow 60%, cyan 100%);
}
.grad-8 {
background-image: linear-gradient(
to right,
red,
#f06d06,
rgb(255, 255, 0),
green
);
}
.grad-9 {
background: linear-gradient(135deg, #f2f2f2 25%, transparent 25%) -20px 0,
linear-gradient(225deg, #f2f2f2 25%, transparent 25%) -20px 0,
linear-gradient(315deg, #f2f2f2 25%, transparent 25%),
linear-gradient(45deg, #f2f2f2 25%, transparent 25%);
background-size: 40px 40px;
background-color: #50e3c2;
}
.grad-10 {
background-image: linear-gradient(90deg, red, transparent, blue);
}
.grad-11 {
background-image: linear-gradient(to top right, indigo, white, deeppink);
}
.grad-12 {
background-image: linear-gradient(to top left, indigo, white, deeppink);
}
.grad-13 {
background-image: linear-gradient(to bottom left, indigo, white, deeppink);
}
.grad-14 {
background-image: linear-gradient(to bottom right, indigo, white, deeppink);
}
.grad-webkit {
background-image: -webkit-linear-gradient(top right, yellow, black, yellow, black);
}
.grad-15 {
background-image: linear-gradient(to top left, red, green, blue);
background-size: 30px 30px;
}
.grad-hints {
background-image: linear-gradient(to right, hotpink, 50%, rebeccapurple);
}
.grad-rainbow {
background-image: linear-gradient(
to right,
tomato,
25%,
orange 0,
50%,
yellowgreen 0,
75%,
dodgerblue 0)
}
</style>
</head>
<body>
<h1>Gradients!</h1>
<b>Simple gradients:</b><br/>
<div class="box grad-0"></div>
<div class="box grad-1"></div>
<div class="box grad-2"></div>
<div class="box grad-3"></div>
<div class="box grad-4"></div>
<b>Funky transition hints:</b><br>
<div class="box grad-5"></div>
<div class="box grad-6"></div>
<div class="box grad-rainbow"></div>
<b>Transition hint test (click to animate):</b><br>
<div id="gradient-hints" class="box grad-hints"></div>
<b>Multiple color stops + arbitrary angles (click to spin!):</b><br>
<div id="gradient-spin" class="rect grad-7"></div>
<b>Default color stops:</b><br>
<div class="box grad-8"></div>
<b>Cool pattern demo</b><br>
<div class="box grad-9"></div>
<b>Pre-multiplied alpha mixing test:</b><br>
<div class="box grad-10"></div>
<b>To corner:</b><br>
<div class="rect grad-11"></div>
<div class="rect grad-12"></div>
<div class="rect grad-13"></div>
<div class="rect grad-14"></div>
<b>With background size:</b><br>
<div class="rect grad-15"></div>
<b>A webkit gradient</b><br>
<div class="box grad-webkit"></div>
</body>
<script>
const boxes = document.querySelectorAll(".box, .rect");
const backgroundMap = {};
for (const rule of document.styleSheets[0].cssRules) {
backgroundMap[rule.selectorText] = rule.style.backgroundImage;
}
// Extract backgroundImage CSS and place above each box
updateLabels = () => {
boxes.forEach(box => {
const grad = box.classList[1];
const cssText = backgroundMap['.'+grad];
let el = document.getElementById(grad);
let newEl = document.createElement('code');
let text = document.createTextNode(box.style.backgroundImage || cssText);
newEl.appendChild(text);
newEl.id = grad;
if (!el)
box.parentNode.insertBefore(newEl, box)
else
box.parentNode.replaceChild(newEl, el);
})
}
const backgroundAnimateDemo = (id, newBackgroundCallback) => {
const el = document.getElementById(id);
let t = 0;
let demoIntervalId = -1;
el.onclick = () => {
if (demoIntervalId <= -1) {
demoIntervalId = setInterval(() => {
el.style.backgroundImage = newBackgroundCallback(t);
t += 1;
updateLabels();
}, 100)
} else {
clearInterval(demoIntervalId);
demoIntervalId = -1;
}
}
}
// Spinning gradient demo/test
backgroundAnimateDemo("gradient-spin", angle => `linear-gradient(${angle}deg, red 0%, black 20%, yellow 60%, cyan 100%)`)
// Transistion hints demo
backgroundAnimateDemo("gradient-hints", t => `linear-gradient(to right, hotpink, ${((Math.sin(t/4)+1)*50)|0}%, rebeccapurple)`)
updateLabels();
</script>
</html>
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