Answers for "box-sizing css meaning"

border-box css

#example1 {
  box-sizing: border-box;
}

css box-sizing

/* Always keep this code inside your css file*/
*{
  box-sizing: border-box;
}
.div-1{
  /* width: 100%; Default - Block Element*/
  padding: 10px;
  box-sizing: border-box; 
  /* 
    content-box is default for box-sizing
    content-box will remove border-box effect.
  */
}
/*
  after applying padding [border also will increase the width]
  10px added to left and right from padding
  the .div-1 width is now 100% + 20px, and that may cause errors in your layout
  according to your work.
  to solve the problem and force the width to be as i give to it
  we use box-sizing => our div width will not be affected by padding or border
*/

* box-sizing border-box

*{
box-sizing: border-box;
}

box sizing

html {
	box-sizing: border-box;
}

*, 
*:before, *:after {
	box-sizing: inherit;
}

textarea { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; width: 100%; }

textarea {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;

    width: 100%;
}