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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>CANVAS Ball</title>
<style>
body {
font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
canvas {
position: absolute;
left: 0;
top: 0;
z-index: -1;
}
#ui {
position: absolute;
right: 1em;
top: 0;
max-width: 30em;
min-width: 17.5em;
border: 1px solid black;
box-shadow: 1px 1px 2px 1px #00000080;
border-radius: 0 0 0.5em 0.5em;
}
#ui > div {
margin: 0.5em 1em;
display: flex;
align-items: center;
gap: 0.2em;
}
</style>
</head>
<body>
<div id="ui">
<div>
<label for="radius">Ball radius:</label>
<input
type="range"
name="radius"
id="radius"
min="2"
value="25"
max="200"
oninput="this.nextElementSibling.innerHTML = this.value" />
<output>25</output>
</div>
<hr />
<div>
<label for="mass">Ball mass:</label>
<input
type="range"
name="mass"
id="mass"
min="1"
value="1"
max="20"
oninput="this.nextElementSibling.innerHTML = this.value" />
<output>1</output>
</div>
</div>
<canvas></canvas>
<script src="index.js"></script>
</body>
</html>