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scaleX()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

scaleX() は CSS の関数で、要素を X 軸に沿って (水平に) 変倍する座標変換を定義します。結果は <transform-function> データ型になります。

試してみましょう

transform: scaleX(1);

transform: scaleX(0.7);

transform: scaleX(1.3);

transform: scaleX(-0.5);

<section id="default-example">
  <img
    class="transition-all"
    id="example-element"
    src="/shared-assets/images/examples/firefox-logo.svg"
    width="200" />
</section>

これは要素のそれぞれの点の横座標（水平座標、 X 座標）を一定の係数で修正しますが、係数が 1 である場合はこの関数が恒等変換になるので例外です。変倍は等方性ではなく、要素の角度は保存されません。 scaleX(-1) は軸の線対称を定義し、垂直軸は (transform-origin プロパティの指定通りに) 原点を通過します。

メモ: scaleX(sx) は scale(sx, 1) または scale3d(sx, 1, 1) と等価です。

構文

css

scaleX(s)

値

s: <number> で、要素のそれぞれの点の横座標に適用される変倍率を表します。

直交座標系 (ℝ^2)	同次座標系 (ℝℙ^2)	直交座標系 (ℝ^3)	同次座標系 (ℝℙ^3)
$(\begin{matrix} s & 0 \\ 0 & 1 \end{matrix})$	$(\begin{matrix} s & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{matrix})$	$(\begin{matrix} s & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{matrix})$	$(\begin{matrix} s & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{matrix})$
$(\begin{matrix} s & 0 \\ 0 & 1 \end{matrix})$	`[s 0 0 1 0 0]`

例

HTML

html

<div>Normal</div>
<div class="scaled">Scaled</div>

CSS

css

div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}
.scaled {
  transform: scaleX(0.6);
  background-color: pink;
}

結果

仕様書

Specification
CSS Transforms Module Level 1 # funcdef-transform-scalex

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This page was last modified on ⁨2025年7月22日⁩ by MDN contributors.

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