asin()

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css

/* åä¸ª <number> å¼ */
transform: rotate(asin(-0.2));
transform: rotate(asin(2 * 0.125));

/* å¶ä»å¼ */
transform: rotate(asin(pi / 5));
transform: rotate(asin(e / 3));

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asin(number) å½æ°ä»æ¥åä¸å¼ä½ä¸ºå¶åæ°ã

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è¥ number å°äº -1 æå¤§äº 1ï¼åç»æä¸º NaNã
è¥ number ä¸º 0â»ï¼åç»æä¸º 0â»ã

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<asin()> = 
  asin( <calc-sum> )  

<calc-sum> = 
  <calc-product> [ [ '+' | '-' ] <calc-product> ]*  

<calc-product> = 
  <calc-value> [ [ '*' | / ] <calc-value> ]*  

<calc-value> = 
  <number>        |
  <dimension>     |
  <percentage>    |
  <calc-keyword>  |
  ( <calc-sum> )  

<calc-keyword> = 
  e          |
  pi         |
  infinity   |
  -infinity  |
  NaN

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HTML

html

<div class="box box-1"></div>
<div class="box box-2"></div>
<div class="box box-3"></div>
<div class="box box-4"></div>
<div class="box box-5"></div>

CSS

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 50px;
}

css

div.box {
  width: 100px;
  height: 100px;
  background: linear-gradient(orange, red);
}
div.box-1 {
  transform: rotate(asin(1));
}
div.box-2 {
  transform: rotate(asin(0.5));
}
div.box-3 {
  transform: rotate(asin(0));
}
div.box-4 {
  transform: rotate(asin(-0.5));
}
div.box-5 {
  transform: rotate(asin(-1));
}