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skewY()

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⁩.

skewY() は CSS の関数で、要素を 2D 平面上で垂直方向にゆがめる変換を定義します。結果は <transform-function> データ型になります。

試してみましょう

transform: skewY(0);

transform: skewY(35deg);

transform: skewY(-0.06turn);

transform: skewY(0.352rad);

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

この変換はシアー変形（せん断写像）で、要素内のそれぞれの点を垂直方向に指定された角度でゆがませます。それぞれの点の縦座標は、指定された角度と原点からの距離に比例した値によって変更されます。よって、原点から遠くなるにしたがって、加えられる値が大きくなります。

構文

css

skewY(a)

値

a: <angle> で、縦座標方向にゆがめるのに使用する角度を表します。

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)
$(\begin{matrix} 1 & 0 \\ tan (a) & 1 \end{matrix})$	$(\begin{matrix} 1 & 0 & 0 \\ tan (a) & 1 & 0 \\ 0 & 0 & 1 \end{matrix})$	$(\begin{matrix} 1 & 0 & 0 \\ tan (a) & 1 & 0 \\ 0 & 0 & 1 \end{matrix})$	$(\begin{matrix} 1 & 0 & 0 & 0 \\ tan (a) & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{matrix})$
$(\begin{matrix} 1 & 0 \\ tan (a) & 1 \end{matrix})$	`[1 tan(a) 0 1 0 0]`

例

HTML

html

<div>Normal</div>
<div class="skewed">Skewed</div>

CSS

css

div {
  width: 80px;
  height: 80px;
  background-color: skyblue;
}
.skewed {
  transform: skewY(40deg);
  background-color: pink;
}

結果

仕様書

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

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This page was last modified on ⁨2025年7月21日⁩ by MDN contributors.

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