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+---
+title: CSS Functional Notation
+slug: Web/CSS/CSS_Functions
+tags:
+  - CSS Function
+  - CSS 函数
+  - attr()
+  - calc()
+  - minmax()
+  - var()
+translation_of: Web/CSS/CSS_Functions
+---
+<div>{{CSSRef}}</div>
+
+<p><strong>CSS 功能符号</strong>是一种 <a href="/en-US/docs/Web/CSS/CSS_Values_and_Units">CSS 值</a>，可以表示更复杂的数据类型或调用特殊的数据处理或计算。</p>
+
+<h2 id="句法">句法</h2>
+
+<pre class="syntaxbox notranslate">selector {
+  property: functional-notation( [argument]? [, argument]! );
+}</pre>
+
+<p>The syntax starts with the <strong>name of the functional notation</strong>, followed by a left parenthesis <code>(</code>. Next up are the notation argument(s), and the function is finished off with a closing parenthesis <code>)</code>.</p>
+
+<p>Functions can take multiple arguments, which are formatted similarly to CSS property values. Whitespace is allowed, but they are optional inside the parentheses. In some functional notations multiple arguments are separated by commas, while others use spaces.</p>
+
+<h2 id="索引">索引</h2>
+
+<p>Functional notation defined by a set of CSS specifications includes the following:</p>
+
+<div class="index"><span>A</span>
+
+<ul>
+ <li>{{CSSxRef("abs", "abs()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("acos", "acos()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("font-variant-alternates/annotation()", "annotation()")}} (font)</li>
+ <li>{{CSSxRef("asin", "asin()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("atan", "atan()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("atan2", "atan2()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("attr")}}</li>
+</ul>
+<span>B</span>
+
+<ul>
+ <li>{{CSSxRef("filter-function/blur", "blur()")}} (filter)</li>
+ <li>{{CSSxRef("filter-function/brightness", "brightness()")}} (filter)</li>
+</ul>
+<span>C</span>
+
+<ul>
+ <li>{{CSSxRef("calc")}} (math)</li>
+ <li>{{CSSxRef("font-variant-alternates/character-variant()", "character-variant()")}} (font)</li>
+ <li>{{CSSxRef("circle", "circle()")}} (shape)</li>
+ <li>{{CSSxRef("clamp")}} (math)</li>
+ <li>{{CSSxRef("color()")}} (colors) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("conic-gradient")}}</li>
+ <li>{{CSSxRef("cos", "cos()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("counter")}}</li>
+ <li>{{CSSxRef("counters")}}</li>
+ <li>{{CSSxRef("filter-function/contrast", "contrast()")}} (filter)</li>
+ <li>{{CSSxRef("cross-fade")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("cubic-bezier", "cubic-bezier()")}}</li>
+</ul>
+<span>D</span>
+
+<ul>
+ <li>{{CSSxRef("device-cmyk", "device-cmyk()")}} (colors) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("filter-function/drop-shadow", "drop-shadow()")}} (filter)</li>
+</ul>
+<span>E</span>
+
+<ul>
+ <li>{{CSSxRef("element")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("env")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("ellipse", "ellipse()")}} (shape)</li>
+ <li>{{CSSxRef("exp", "exp()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>F</span>
+
+<ul>
+ <li>{{CSSxRef("fit-content", "fit-content()")}}</li>
+ <li>{{CSSxRef("format", "format()")}}</li>
+</ul>
+<span>G</span>
+
+<ul>
+ <li>{{CSSxRef("filter-function/grayscale", "grayscale()")}} (filter)</li>
+</ul>
+<span>H</span>
+
+<ul>
+ <li>{{CSSxRef("hsl", "hsl()")}} (colors)</li>
+ <li>{{CSSxRef("hsla", "hsla()")}} (colors)</li>
+ <li>{{CSSxRef("filter-function/hue-rotate", "hue-rotate()")}} (filter)</li>
+ <li>{{CSSxRef("hwb", "hwb()")}} (colors) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("hypot", "hypot()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>I</span>
+
+<ul>
+ <li>{{CSSxRef("imagefunction", "image()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("image-set")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("inset()")}} (shape)</li>
+ <li>{{CSSxRef("filter-function/invert", "invert()")}} (filter)</li>
+</ul>
+<span>L</span>
+
+<ul>
+ <li>{{CSSxRef("lab", "lab()")}} (colors) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("lch", "lch()")}} (colors) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("leader", "leader()")}}</li>
+ <li>{{CSSxRef("linear-gradient")}}</li>
+ <li>{{CSSxRef("local", "local()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("log", "log()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>M</span>
+
+<ul>
+ <li>{{CSSxRef("transform-function/matrix", "matrix()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/matrix3d", "matrix3d()")}} (transform)</li>
+ <li>{{CSSxRef("max")}} (math)</li>
+ <li>{{CSSxRef("min")}} (math)</li>
+ <li>{{CSSxRef("minmax")}} (math)</li>
+ <li>{{CSSxRef("mod", "mod()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>O</span>
+
+<ul>
+ <li>{{CSSxRef("filter-function/opacity", "opacity()")}} (filter)</li>
+ <li>{{CSSxRef("font-variant-alternates/ornaments()", "ornaments()")}} (font)</li>
+</ul>
+<span>P</span>
+
+<ul>
+ <li>{{CSSxRef("paint")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("path", "path()")}} (shape)</li>
+ <li>{{CSSxRef("transform-function/perspective", "perspective()")}} (transform)</li>
+ <li>{{CSSxRef("polygon", "polygon()")}} (shape)</li>
+ <li>{{CSSxRef("pow", "pow()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>R</span>
+
+<ul>
+ <li>{{CSSxRef("radial-gradient")}}</li>
+ <li>{{CSSxRef("rem", "rem()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("repeat")}}</li>
+ <li>{{CSSxRef("repeating-linear-gradient")}}</li>
+ <li>{{CSSxRef("repeating-radial-gradient")}}</li>
+ <li>{{CSSxRef("repeating-conic-gradient")}}</li>
+ <li>rgb() (colors)</li>
+ <li>rgba() (colors)</li>
+ <li>{{CSSxRef("transform-function/rotate", "rotate()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/rotate3d", "rotate3d()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/rotateX", "rotateX()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/rotateY", "rotateY()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/rotateZ", "rotateZ()")}} (transform)</li>
+ <li>{{CSSxRef("round", "round()")}} (math) {{Experimental_Inline}}</li>
+</ul>
+<span>S</span>
+
+<ul>
+ <li>{{CSSxRef("filter-function/saturate", "saturate()")}} (filter)</li>
+ <li>{{CSSxRef("transform-function/scale", "scale()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/scale3d", "scale3d()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/scaleX", "scaleX()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/scaleY", "scaleY()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/scaleZ", "scaleZ()")}} (transform)</li>
+ <li>{{CSSxRef("filter-function/sepia", "sepia()")}} (filter)</li>
+ <li>{{CSSxRef("sign", "sign()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("sin", "sin()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("transform-function/skew", "skew()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/skewX", "skewX()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/skewY", "skewY()")}} (transform)</li>
+ <li>{{CSSxRef("sqrt", "sqrt()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("steps", "steps()")}}</li>
+ <li>{{CSSxRef("font-variant-alternates/styleset()", "styleset()")}} (font)</li>
+ <li>{{CSSxRef("font-variant-alternates/stylistic()", "stylistic()")}} (font)</li>
+ <li>{{CSSxRef("font-variant-alternates/swash()", "swash()")}} (font)</li>
+ <li>{{CSSxRef("symbols", "symbols()")}}</li>
+</ul>
+<span>T</span>
+
+<ul>
+ <li>{{CSSxRef("tan", "tan()")}} (math) {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("target-counter", "target-counter()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("target-counters", "target-counters()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("target-text", "target-text()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("toggle", "toggle()")}} {{Experimental_Inline}}</li>
+ <li>{{CSSxRef("transform-function/translate", "translate()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/translate3d", "translate3d()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/translateX", "translateX()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/translateY", "translateY()")}} (transform)</li>
+ <li>{{CSSxRef("transform-function/translateZ", "translateZ()")}} (transform)</li>
+</ul>
+<span>U</span>
+
+<ul>
+ <li>{{CSSxRef("url()", "url()")}}</li>
+</ul>
+<span>V</span>
+
+<ul>
+ <li>{{CSSxRef("var")}}</li>
+</ul>
+</div>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("CSS4 Values")}}</td>
+   <td>{{Spec2("CSS4 Values")}}</td>
+   <td>Adds <code>toggle()</code>, <code>attr()</code>, <code>calc()</code>, <code>min()</code>, <code>max()</code>, <code>clamp()</code>, <code>round()</code>, <code>mod()</code>, <code>rem()</code>, <code>mod()</code>, <code>sin()</code>, <code>cos()</code>, <code>tan()</code>, <code>asin()</code>, <code>acos()</code>, <code>atan()</code>, <code>atan2()</code>, <code>pow()</code>, <code>sqrt()</code>, <code>hypot()</code>, <code>log()</code>, <code>exp()</code>, <code>abs()</code> and <code>sign()</code> functional notation.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS3 Values")}}</td>
+   <td>{{Spec2("CSS3 Values")}}</td>
+   <td>Adds <code>calc()</code> functional notation.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS4 Colors")}}</td>
+   <td>{{Spec2("CSS4 Colors")}}</td>
+   <td>Adds commaless syntaxes for the <code>rgb()</code>, <code>rgba()</code>, <code>hsl()</code>, and <code>hsla()</code> functional notation.<br>
+    Allows alpha values in <code>rgb()</code> and <code>hsl()</code>, turning <code>rgba()</code> and <code>hsla()</code> into (deprecated) aliases for them.<br>
+    Adds <code>hwb()</code>, <code>device-cmyk()</code>, and <code>color()</code> functions.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS3 Colors")}}</td>
+   <td>{{Spec2("CSS3 Colors")}}</td>
+   <td>Adds <code>rgba()</code>, <code>hsl()</code>, <code>hsla()</code> functional notation.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS4 Images")}}</td>
+   <td>{{Spec2("CSS4 Images")}}</td>
+   <td>Adds <code>element()</code>, <code>image()</code>, <code>image-set()</code> and <code>conic-gradient()</code> functional notation.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="也可以看看">也可以看看</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/CSS/CSS_Values_and_Units">CSS Values and Units</a></li>
+ <li><a href="/en-US/docs/Learn/CSS/Introduction_to_CSS/Values_and_units">Introduction to CSS: Values and Units </a></li>
+</ul>
+
+<div id="gtx-trans" style="position: absolute; left: 166px; top: 4490px;">
+<div class="gtx-trans-icon"></div>
+</div>