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    <title>CSS Clip-Path: Shaping Web Elements</title>
    <style>
        body {
            font-family: sans-serif;
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        .container {
            display: flex;
            justify-content: center;
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        .code-example pre {
            margin: 0;
        }
        .image-example {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 2em;
        }
        .image-example img {
            max-width: 100%;
            height: auto;
        }
        .key-takeaway {
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<body>
    <div class="container">
        <img src="/static/imghw/default1.png"  data-src="https://img.php.cn/upload/article/000/000/000/174009775169997.jpg"  class="lazy" alt="Introducing the CSS clip-path Property " />
    </div>

    <p>The web's predominantly rectangular layout contrasts with print media's diverse shapes.  This difference stems partly from a lack of suitable tools. This tutorial introduces <code>clip-path</code>, a CSS property offering the design flexibility of print.</p>

    <div class="key-takeaway">
        <h2>Key Takeaways</h2>
        <ul>
            <li><code>clip-path</code> masks parts of an element, exceeding the limitations of the deprecated <code>clip</code> property (rectangular clipping only).</li>
            <li>It supports basic shapes, geometry boxes, or SVG <code><clippath></code> URLs for complex shapes and animations.</li>
            <li>Animating <code>clip-path</code> requires matching vertex counts in initial and final shapes for smooth transitions.</li>
            <li>While not universally supported, major modern browsers (Chrome, Safari, Opera) support <code>clip-path</code> (often with prefixes). Firefox support is partial.</li>
        </ul>
    </div>

    <h2>The Basics</h2>
    <p>Clipping trims parts of an element, partially or fully hiding it.  The <i>clipping path</i> defines the visible region, whether a simple shape or a complex polygon.  The <i>clipping region</i> is the area within this path.  Anything outside is hidden, including backgrounds, borders, shadows, and events.</p>
    <p>Even with non-rectangular elements, surrounding content flows naturally. For shape-aware content flow, use the <code>shape-outside</code> property (see related SitePoint tutorial).</p>
    <p>Remember: <code>clip-path</code> differs from the limited, deprecated <code>clip</code> property.</p>

    <h2>Syntax and Usage</h2>
    <p>The syntax is: <code>clip-path: <clip-source> | [<basic-shape> || <geometry-box>] | none</code></p>
    <ul>
        <li><code><clip-source></code>: An SVG <code><clippath></code> URL.</li>
        <li><code><basic-shape></code>: Basic shape functions (CSS Shapes spec).</li>
        <li><code><geometry-box></code>: (Optional) Reference box for <code><basic-shape></code>, or defines the clipping shape itself (e.g., <code>margin-box</code>).</li>
    </ul>

    <div class="code-example">
        <pre class="brush:php;toolbar:false"><code>img {
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

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這會產生菱形。頂點坐標（x，y）相對於元素的框，是順時針。