What does em stand for in css

Vh and vw

/*vh viewport height and vw viewport width*/
/*example*/
div
{
  display: inline-block;
  height: 100vh; /*THis will set height equal to the height of windows*/
  width: 100vw/*This will set width equal to width of windows*/
}

What does em stand for in css

em = relative to parent element fontsize
rem = relative to root fontsize of html

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