Pen Settings

HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

Learn more · Versions

Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

Learn more · Versions

CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

Powered by Algolia
About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Powered by Algolia
About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <!-- <div class="has-support" data-support="css-trig-fns"><p>✅ Your browser supports the CSS Trigonometric Functions. Use the range slider to adjust the angle.</p></div> -->
<div class="no-support" data-support="css-trig-fns"><p>🚨 Your browser does not support the CSS Trigonometric Functions. Therefore, this demo will not work properly. Please try Safari 15.4, Firefox 108, or Chrome 111.</p></div>
<div>
	<label>
		<code>--radius</code> = <code>25vmin</code>
	</label>
	<label for="input">
		<code>--angle</code> = <code><output data-for="angle">030</output>deg</code><br>
		<input type="range" min="0" max="360" step="15" value="30" id="input" />
	</label>
</div>

<div id="visual">
	<!-- The dot -->
	<span class="dot" data-show-when-has-support="css-trig-fns"></span>
	
	<!-- The angle indicator -->
	<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" data-show-when-has-support="css-trig-fns">
        <circle cx="50" cy="50" r="45.5" stroke="#333" stroke-width="1" fill="transparent" />
	</svg>
</div>

<details>
	<summary>Debug</summary>
	<dl>
		<dt><code>--angle</code></dt>
		<dd>= <code><output data-for="angle">0</output>deg</code></dd>
		<dt><code>cos(--angle)</code></dt>
		<dd>= <output data-for="cos">1.00</output></dd>
		<dt><code>sin(--angle)</code></dt>
		<dd>= <output data-for="sin">0.00</output></dd>
		<dt><code>tan(--angle)</code></dt>
		<dd>= <output data-for="tan">0.00</output></dd>
		<dt><code>--radius</code></dt>
		<dd>= <code>25vmin</code></dd>
		<dt>Length of Hypothenuse <em>(yellow line)</em></dt>
		<dd>= <code>--radius</code> = <code>25vmin</code></dd>
		<dt>Length of adjacent side <em>(red line)</em></dt>
		<dd>= hypothenuse * <code>cos(--angle)</code> = <code>25vmin</code> * <output data-for="cos">1.00</output> = <code><output data-for="adj">25</output>vmin</code></dd>
		<dt>Lenght of opposite side <em>(blue line)</em></dt>
		<dd>= hypothenuse * <code>sin(--angle)</code> = <code>25vmin</code> * <output data-for="sin">0.00</output> = <code><output data-for="opp">0</output>vmin</code></dd></dd>
	</dl>
</details>

<footer>
	<p>Demo for <a href="https://web.dev/css-trig-functions/" target="_top">https://web.dev/css-trig-functions/</a></p>
</footer>
!

CSS 

              
                @layer base, demosupport;

/* Register --angle. That way we can transition and animate it 😎 */
@property --angle {
	syntax: '<angle>';
	initial-value: 0deg;
	inherits: true;
}
/* Initial value for browsers that don’t support @property */
:root {
	--angle: 0deg;
}

/* The visualization */
#visual {
	/* Dimensions of the visualization */
	--radius: 25vmin;
	--tracksize: 5vmin;

	/* Make it a circle, based on the dimensions */
	width: calc(var(--radius) * 2 + var(--tracksize));
	aspect-ratio: 1;
	border-radius: 50%;
	border: var(--tracksize) solid #ccc;
	
	/* Some generic positioning stuff */
	margin: 0 auto;
	position: relative;

	/* Transition the angle value when updating it */
	transition: --angle 0.5s ease-in-out;
}

/* The black dot */
.dot {
	/* Make it a circle */
	display: block;
	width: var(--tracksize);
	aspect-ratio: 1;
	border-radius: 50%;
	
	/* Center it */
	position: absolute;
	left: calc(50% - (var(--tracksize) / 2));
	top: calc(50% - (var(--tracksize) / 2));
	
	/* Color it */
	background: #333;
	border: 1px solid #333;
	
	/* Position around center of parent, by taking --angle into account */
	translate: calc(cos(var(--angle)) * var(--radius))      /* Translation on X-axis */
		       calc(sin(var(--angle) * -1) * var(--radius)) /* Translation on Y-axis */
	;
}


















@layer demosupport {
	
	@layer lines {
		/* Lines: Shared styles */
		#visual::before, #visual::after,
		.dot::before, .dot::after {
			content: '';
			display: block;
			position: absolute;
			left: calc(50% - 1px);
			top: calc(50% - 1px);
			transform-origin: 1px 1px;
			z-index: 3;
		}
		
		/* Line: Adjacent side */
		#visual::before {
			background: red;
			height: 2px;
			width: var(--radius);
			transform: scaleX(calc(cos(var(--angle)))); /* Adjust scale on X axis by taking the cos() into account */
		}

		/* Line: Opposite side */
		#visual::after {
			background: blue;
			width: 2px;
			height: var(--radius);
			transform: translateX(calc(cos(var(--angle)) * var(--radius))) /* Translate entire line on the X-axis so that it draws at the outer edge of the red line */
					   scaleY(calc(sin(var(--angle) * -1)))                /* Adjust scale on Y axis by taking the sin() into account */
			;
		}

		/* Line: Hypothenuse */
		.dot::before {
			background: yellow;
			width: var(--radius);
			height: 2px;
			transform: rotate(calc(var(--angle) * -1)) /* Counterrotate to angle the .dot is at */
					   translate(-100%, -50%)          /* Move back so that it appears to start from center */
			;
		}

		/* Line: Tangent */
		.dot::after {
			background: lime;
			width: var(--radius);
			height: 2px;
			rotate: calc(90deg + var(--angle) * -1);
			transform: scaleX(tan(var(--angle)));
		}
		
	}
	
	@layer angledebugger {
		@property --progress {
			syntax: '<number>';
			initial-value: 0;
			inherits: true;
		}
		:root {
			--progress: 0;
		}

		svg {
			position: absolute;
			inset: calc(var(--tracksize) * -1);
			width: calc(100% + var(--tracksize) + var(--tracksize));
			height: calc(100% + var(--tracksize) + var(--tracksize));
			z-index: 1;
			pointer-events: none;
		}
		circle {
			--radius: 45.5; /* = attr(r) */
			--circumference: calc(var(--radius) * 3.141526 * 2);
			transform-origin: 50% 50%;
			transform: scaleY(-1);
			stroke-dasharray: var(--circumference);
			stroke-dashoffset: calc(var(--circumference) - (var(--circumference) * var(--progress)));

			/* Transition the progress value when updating it */
			transition: --progress 0.5s ease-in-out;
		}
	}

	/* Layout things specific to this demo */
	@layer layout {
		details {
			position: absolute;
			left: 0.5rem;
			top: 0.5rem;
			border: 0.1rem solid #ccc;
			border-radius: 0.2rem;
			padding: 1rem;
			background: rgb(116 170 238 / 88%);
		}

		label {
			text-align: center;
			display: block;
		}
		
		footer {
			text-align: center;
			font-style: italic;
		}
	}
}

/* Non-demo styles below */
@layer base {
	@layer reset {
		* {
			box-sizing: border-box;
		}
		body {
			margin: 0;
			padding: 0;
		}
		html, body {
			min-height: 100%;
		}
	}
	@layer layout {
		html {
			max-width: 84ch;
			padding: 3rem 2rem;
			margin: auto;
		}
		body {
			display: grid;
			place-content: safe center;
			gap: 2rem;
		}

		html {
			--font-sans: system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;
			--font-serif: ui-serif,serif;
			--font-mono: Dank Mono,Operator Mono,Inconsolata,Fira Mono,ui-monospace,SF Mono,Monaco,Droid Sans Mono,Source Code Pro,monospace;
		}
		body {
			font-family: var(--font-sans);
		}
		pre, code {
			font-family: var(--font-mono);
			font-size: 0.8rem;
		}
		input, button {
			font-family: inherit;
		}

		a,
		a:visited {
			color: blue;
		}
		
		h2 {
			margin-top: 2em;
		}

		summary {
			cursor: pointer;
		}

		dd + dt {
			margin-top: 0.5em;
		}
	}
	
	@layer code {
		pre {
			border: 1px solid #dedede;
			padding: 1em;
			background: #f7f7f7;
			font-family: "Courier 10 Pitch", Courier, monospace;
			overflow-x: auto;
			border-left: 0.4em solid cornflowerblue;
			tab-size: 4;
		}
		
		code:not(pre code), output:not(code:has(output) output) {
			background: #f7f7f7;
			border: 1px solid rgb(0 0 0 / 0.2);
			padding: 0.1rem 0.3rem;
			margin: 0.1rem 0;
			border-radius: 0.2rem;
			display: inline-block;
		}
	}

	@layer support {
		.no-support,
		.has-support {
			margin: 1em 0;
			padding: 1em;
			border: 1px solid #ccc;
		}

		.no-support {
			background-color: #ff00002b;
		}
		.no-support[data-level="warn"] {
			background-color: #ffff002b;
		}
		.has-support {
			background-color: #00ff002b;
		}
		
		.no-support, [data-show-when-no-support] {
			display: block !important;
		}
		.has-support, [data-show-when-has-support] {
			display: none !important;
		}

		:is(.has-support, .no-support) > :first-child {
			margin-top: 0;
		}
		:is(.has-support, .no-support) > :last-child {
			margin-bottom: 0;
		}

		@supports (transform: scaleX(cos(360deg))) {
			.no-support[data-support="css-trig-fns"] {
				display: none !important;
			}
			.has-support[data-support="css-trig-fns"], [data-show-when-has-support="css-trig-fns"] {
				display: block !important;
			}
		}
	}
}
!

JS 

              
                const radius = 25;

const $input = document.querySelector('#input');
const $label = document.querySelector('[for="input"]');
const $visual = document.querySelector('#visual');

const $$angle = document.querySelectorAll('output[data-for="angle"]');
const $$cos = document.querySelectorAll('output[data-for="cos"]');
const $$sin = document.querySelectorAll('output[data-for="sin"]');
const $$tan = document.querySelectorAll('output[data-for="tan"]');
const $$adj = document.querySelectorAll('output[data-for="adj"]');
const $$opp = document.querySelectorAll('output[data-for="opp"]');

const degrees_to_radians = deg => (deg * Math.PI) / 180.0;

const calc = () => {
	// Update CSS Custom Property Value
	const angle_in_degrees = $input.valueAsNumber;
	document.documentElement.style.setProperty('--angle', `${angle_in_degrees}deg`);
	
	// Derive total progress [0-1] from angle
	const progress = angle_in_degrees / 360;
	document.documentElement.style.setProperty('--progress', progress);
	
	// Update outputs (not needed for CSS)
	const angle_in_radians = degrees_to_radians(angle_in_degrees);
	const cos = Math.cos(angle_in_radians);
	const sin = Math.sin(angle_in_radians);
	const tan = Math.tan(angle_in_radians);

	$$angle.forEach($angle => $angle.innerText = angle_in_degrees.toString().padStart(3, '0'));
	$$cos.forEach($cos => $cos.innerText = cos.toFixed(2));
	$$sin.forEach($sin => $sin.innerText = sin.toFixed(2));
	$$tan.forEach($tan => $tan.innerText = tan.toFixed(2));
	$$adj.forEach($adj => $adj.innerText = (radius * cos).toFixed(2));
	$$opp.forEach($opp => $opp.innerText = (radius * sin).toFixed(2));
}

$input.addEventListener('input', calc);
calc();
!
999px

Console