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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                - let data = {
- 	function: [ 'round', 'mod', 'rem', 'sin', 'cos', 'tan', 'asin', 'acos', 'atan', 'atan2', 'pow', 'sqrt', 'exp', 'log', 'hypot', 'abs', 'sign' ], 
- 	constant: ['e', 'pi', 'infinity', '-infinity']
- };

p Confused about what browser supports what mathematical functions/ constants? This Pen uses 
	code @supports
	|  to tell you what the browser you're currently viewing it in supports and what not.
p As of April 2023, Safari (tested via Epiphany as I'm on Ubuntu) supports everything, Firefox 113 supports everything except 
	code abs()
	|  and 
	code sign()
	|  (which can be easily 
	a(href='https://css-tricks.com/using-absolute-value-sign-rounding-and-modulo-in-css-today/' target='_blank') emulated
	|  using other very well supported functions though), while Chrome 111+ only supports constants and trigonometric functions. Plus 
	code abs()
	|  and 
	code sign()
	|  starting with version 113, as well as all the others starting with version 115, even if only behind the 
	b Experimental Web Platform features
	|  flag (which can be enabled from 
	code chrome://flags
	| ).
- for(let p in data)
	- let a = data[p], n = a.length;
	- for(let i = 0; i < n; i++)
		- let c = a[i];
		- let cond = p === 'function';
		- let url = cond ? 'funcdef' : 'valdef-calc'
		.box(data-feat=`${p}--${c}` data-test='1') Yay, your browser supports the 
			a(href=`https://drafts.csswg.org/css-values-4/#${url}-${c}` target='_blank')
				code #{c}#{cond ? '()' : ''}
			|  #{p}! 🥳 🎉
		.box(data-feat=`${p}--${c}`) Sorry, your browser does not support the 
			a(href=`https://drafts.csswg.org/css-values-4/#${url}-${c}` target='_blank')
				code #{c}#{cond ? '()' : ''}
			|  #{p}. 😿
footer
	p The info boxes were created as described in 
		a(href='https://codepen.io/thebabydino/full/qBKvjKM' target='_blank') this Pen
		| .
	p Got any other questions about this? Found any problems with it?
		br
		| You can drop a comment 
		a(href='https://codepen.io/thebabydino/details/yLRBJXP' target='_blank') here
		|  or ping me on 
		a(href='https://mastodon.social/@anatudor' target='_blank' data-ico='🦣') Mastodon
		|  
		|  or on 
		a(href='https://twitter.com/anatudor' target='_blank' data-ico='🐦') Twitter
		| .
	p And if you like the Maths and Physics infused CSS, canvas and SVG work that I've been putting out for over a decade, you can support it by being a cool cat and becoming a patron on 
		a(href='https://www.patreon.com/anatudor' target='_blank') Patreon
		|  or with a one time donation on 
		a(href='https://ko-fi.com/anatudor' target='_blank') Ko-fi
		| . Or at least by sharing this to show the world what can be done with CSS these days... because it's pretty damn cool!
!

CSS 

              
                $s: 4px;

/* ----- relevant styles ----- */
.box {
	/* here's where the cool part starts: 
	 * different styles for the yay/ nay boxes */
	border-left: solid 5px #db3056;
	background: #851d41;
	
	/* a value of 1 if it indicates feature is supported */
	&[data-test='1'] {
		border-color: #4e8d7c;
		background: #045762;
		display: none
	}
	
	/* ----- THE MAGIC ----- */
	
	/* support test for the round() function */
	@supports (z-index: Round(4.1*.5, 1)) {
		&[data-feat='function--round'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the mod() function */
	@supports (z-index: Mod(5, 2)) {
		&[data-feat='function--mod'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the rem() function */
	@supports (z-index: Rem(5, 2)) {
		&[data-feat='function--rem'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the sin() function */
	@supports (top: calc(sin(45deg)*1em)) {
		&[data-feat='function--sin'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the cos() function */
	@supports (top: calc(cos(45deg)*1em)) {
		&[data-feat='function--cos'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the tan() function */
	@supports (top: calc(tan(45deg)*1em)) {
		&[data-feat='function--tan'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the asin() function */
	@supports (rotate: asin(.5)) {
		&[data-feat='function--asin'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the acos() function */
	@supports (rotate: acos(.5)) {
		&[data-feat='function--acos'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the atan() function */
	@supports (rotate: atan(.5)) {
		&[data-feat='function--atan'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the atan2() function */
	@supports (rotate: atan2(4, 3)) {
		&[data-feat='function--atan2'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the pow() function */
	@supports (z-index: pow(2, 2)) {
		&[data-feat='function--pow'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the sqrt() function */
	@supports (z-index: Sqrt(4)) {
		&[data-feat='function--sqrt'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the exp() function */
	@supports (top: calc(Exp(2)*1em)) {
		&[data-feat='function--exp'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the log() function */
	@supports (top: calc(Log(4, 2)*1em)) {
		&[data-feat='function--log'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the hypot() function */
	@supports (top: Hypot(4em, 3em)) {
		&[data-feat='function--hypot'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the abs() function */
	@supports (z-index: Abs(-5)) {
		&[data-feat='function--abs'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the sign() function */
	@supports (z-index: Sign(-5)) {
		&[data-feat='function--sign'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the e constant */
	@supports (top: calc(e*1em)) {
		&[data-feat='constant--e'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the pi constant */
	@supports (rotate: calc(.25turn*pi)) {
		&[data-feat='constant--pi'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the infinity constant */
	@supports (rotate: atan(infinity)) {
		&[data-feat='constant--infinity'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
	
	/* support test for the -infinity constant */
	@supports (rotate: atan(-infinity)) {
		&[data-feat='constant---infinity'] { 
			display: none;
			
			&[data-test='1'] { display: block }
		}
	}
}

/* ----- all the prettifying, less important styles ----- */
body {
	box-sizing: border-box;
	margin: 0 auto;
	max-width: 47em;
	padding: .5em;
	background: #262434;
	color: #fff;
	font: 1.25em/ 1.3 ubuntu, trebuchet ms, sans-serif
}

a {
	--hl: 0;
	position: relative;
	z-index: 1;
	padding: 0 .5*$s;
	color: gold;
	text-decoration: none;
	isolation: isolate;
	
	&::before {
		position: absolute;
		inset: 0;
		transform-origin: 0 100%;
		transform: scaley(calc(var(--hl) - .1*(1 - var(--hl))));
		background: currentcolor;
		mix-blend-mode: difference;
		transition: transform .35s ease-out;
		content: ''
	}
	
	&:focus { outline: none }
	&:hover, &:focus { --hl: 1 }
}

[data-ico] {
	margin-right: 1.5em;
	
	&::after {
		position: absolute;
		left: calc(100% + 2px);
		content: ' ' attr(data-ico)
	}
}

div {
	position: relative;
	margin: .375em 0;
	padding: .25em .5em;
	box-shadow: 0 2px 5px -2px #141414, 
		0 5px 13px -5px #040404
}

code {
	font-family: ubuntu mono, consoas, monaco, monospace;
	font-size: 1.125em	
}

footer {
	font-size: .75em;
	text-align: center
}
!

JS
!
999px

Console