<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: tab-size, word-spacing and letter-spacing</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#tab-size-property">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-spacing-property">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#letter-spacing-property">
<link rel="match" href="tab-size-spacing-001-ref.html">
<meta name="assert" content="For the tab-size property, a <number> represents the measure as a multiple of the space character’s advance width (U+0020) including its associated letter-spacing and word-spacing">
<style>
.test {
  white-space: pre;
  tab-size: 8; /* the initial value, but since we're measuring against it, we might as well be sure */
  font-family: monospace; /* because the ch unit is based on the size of the 0 character,
                             and we want to measure space characters
                             so they need to be the same size. */
  letter-spacing: 2px;
  word-spacing: 10px;
}
span {
  display: inline-block;
  width: 20px;
  height: 20px;
  background: green;
}
.ref {
  position: absolute;
  z-index: -1;
  width: 20px;
  height: 20px;
  background: red;
  margin-left: calc( 8ch + 8 * 2px + 8 * 10px );

   /* this is to avoid antialiasing effects at the edge */
   box-sizing: border-box;
   border: 2px solid white;
}
</style>

<p>Test passes if there is a green square and no red.
<div class=ref></div>
<div class=test>&#x09;<span></span></div>