abs()

/* property: abs(expression) */
width: abs(20% - 100px);

abs(x) .

x

.

x .

• x 0 x .
• -1 * x .

<abs()> = 
  abs( <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        

abs() . CSS --font-size font-size . abs() .

h1 {
  font-size: abs(var(--font-size));
}

abs() . -45deg . abs() .

div {
  --deg: -45deg;
  background-image: linear-gradient(abs(var(--deg)), blue, red);
}

CSS abs() CSS max() . .

p {
  line-height: max(var(--lh), -1 * var(--lh));
}

max() var(--lh) -1 * var(--lh) . --lh , .

• sign()