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Add CSS typed arithmetic examples (#339)
* Add CSS typed arithmetic examples * Add entry to README file * code simplification / improvement * A few more small improvements
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‎README.md‎

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@@ -31,6 +31,8 @@ Code examples that accompany various MDN DOM and Web API documentation pages.
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- The "css-progress" directory contains an example demonstrating the [CSS `progress()` function](https://developer.mozilla.org/en-US/docs/Web/CSS/progress). See the [example live](https://mdn.github.io/dom-examples/css-progress).
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- The "css-typed-arithmetic" directory contains an example demonstrating [CSS typed arithmetic](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Values_and_Units/Using_CSS_typed_arithmetic) usage. See the [index page](https://mdn.github.io/dom-examples/css-typed-arithmetic) to access the live examples.
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- The "device-posture-api" directory contains an example demonstrating how to use the [Device Posture API](https://developer.mozilla.org/docs/Web/API/Device_Posture_API). [Run the example live](https://mdn.github.io/dom-examples/device-posture-api/).
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- The "drag-and-drop" directory is for examples and demos of the [HTML Drag and Drop](https://developer.mozilla.org/docs/Web/API/HTML_Drag_and_Drop_API) standard.

‎css-typed-arithmetic/animated-story-circle/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Animated story circle</title>
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<link href="style.css" rel="stylesheet" />
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</head>
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<body>
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<div class="support-info">
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The rotation of each colored story section is calculated based on its
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<code>sibling-index()</code> multiplied by a ratio of the width of the
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<code>&lt;body&gt;</code> element and <code>1200px</code>. At the time of
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writing, this works in Chromium 140+ and Safari 26+.
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</div>
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<div class="story-circle">
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<p><strong>Hello there!</strong></p>
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<p>This is</p>
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<p>quite an</p>
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<p>interesting way</p>
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<p>to tell a</p>
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<p>story</p>
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<p>all around in</p>
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<p>a circle.</p>
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<p>What fun!</p>
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</div>
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</body>
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</html>

‎css-typed-arithmetic/animated-story-circle/style.css‎

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:root {
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height: 100%;
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font-family: sans-serif;
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}
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body {
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height: inherit;
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margin: 0 auto;
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min-width: 400px;
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max-width: 1600px;
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display: flex;
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align-items: center;
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justify-content: center;
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container-type: inline-size;
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}
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.story-circle {
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width: 1px;
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height: 1px;
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--width-percentage: calc((100cqw / 1200px) - 0.33333);
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}
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p {
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padding: 10px;
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width: 150px;
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text-align: right;
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background: linear-gradient(to right, red, orange 50%);
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border-radius: 5px;
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position: absolute;
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transform-origin: center left;
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--angle: calc(
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((sibling-index() - 1) * (360 / sibling-count())) * var(--width-percentage)
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);
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rotate: calc(var(--angle) * 1deg);
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}
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/* Support information */
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.support-info {
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padding: 5px;
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background-color: yellow;
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border: 1px solid black;
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position: absolute;
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top: 5px;
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left: 5px;
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right: 5px;
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}

‎css-typed-arithmetic/different-type-variations/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>CSS typed arithmetic demo</title>
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<link href="style.css" rel="stylesheet" />
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</head>
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<body>
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<div class="support-info">
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The paragraph <code>background-color</code> and
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<code>font-size</code> should change depending on the viewport width, as
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expressed in pixels in the <code>--viewport-in-pixels</code> custom
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property. At the time of writing, this works in Chromium 140+ and Safari
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26+.
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</div>
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<p>Hello there!</p>
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</body>
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</html>

‎css-typed-arithmetic/different-type-variations/style.css‎

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:root {
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font-family: sans-serif;
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--viewport-in-pixels: calc(100vw / 1px);
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}
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p {
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border: 5px solid black;
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text-align: center;
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font-size: calc(1em * (var(--viewport-in-pixels) / 200));
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background-color: lch(
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75% 50% calc((100 + (var(--viewport-in-pixels) / 10)) * 1deg)
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);
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}
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/* Support information */
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.support-info {
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padding: 5px;
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background-color: yellow;
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border: 1px solid black;
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}

‎css-typed-arithmetic/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width" />
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<title>CSS typed arithmetic examples</title>
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</head>
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<body>
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<h1>CSS typed arithmetic examples</h1>
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<ul>
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<li>
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<a href="responsive-background-opacity/index.html"
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>Responsive background opacity</a
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>
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</li>
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<li>
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<a href="different-type-variations/index.html"
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>Different type variations</a
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>
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</li>
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<li>
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<a href="animated-story-circle/index.html">Animated story circle</a>
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</li>
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</ul>
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<h2>More information</h2>
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<ul>
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<li>
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<a
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href="https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Values_and_Units/Using_typed_arithmetic"
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>Using CSS typed arithmetic</a
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>
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</li>
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<li>
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<a
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href="https://github.com/mdn/dom-examples/tree/main/css-typed-arithmetic"
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>The code used on these pages</a
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>
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</li>
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</ul>
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</body>
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</html>

‎css-typed-arithmetic/responsive-background-opacity/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Responsive background opacity demo</title>
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<link href="style.css" rel="stylesheet" />
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</head>
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<body>
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<div class="wrapper">
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<h1>Prose of the century</h1>
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<p>
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla luctus
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aliquam dolor, eu lacinia lorem placerat vulputate. Duis felis orci,
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pulvinar id metus ut, rutrum luctus orci. Cras porttitor imperdiet nunc,
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at ultricies tellus laoreet sit amet.
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</p>
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<div class="support-info">
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The opacity of the background image decreases as the viewport width
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decreases. At the time of writing, this works in Chromium 140+.
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</div>
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</div>
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</body>
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</html>

‎css-typed-arithmetic/responsive-background-opacity/style.css‎

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:root {
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font-family: sans-serif;
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--width-percentage: calc((100vw / 2000px));
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}
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.wrapper {
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width: 480px;
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padding: 20px;
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margin: 0 auto;
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}
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body {
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background: linear-gradient(
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rgb(255 255 255 / calc(1 - var(--width-percentage))),
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rgb(255 255 255 / calc(1 - var(--width-percentage)))
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),
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url("https://mdn.github.io/shared-assets/images/examples/colorful-heart.png")
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no-repeat top 50px right 50px;
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}
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p {
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line-height: 1.5;
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}
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/* Support information */
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.support-info {
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padding: 5px;
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background-color: yellow;
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border: 1px solid black;
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}

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