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                <!-- EDITING -->
<label for="range">Spacing</label>
<input id="range" type="range" name="SPAC" min="0" max="50" value="0">

<!-- ARTICLE -->
    <p>Roboto has a dual nature. It has a mechanical skeleton and the forms are largely geometric. At the same time, the font features friendly and open curves. While some grotesks distort their letterforms to force a rigid rhythm, Roboto doesn’t compromise, allowing letters to be settled into their natural width. This makes for a more natural reading rhythm more commonly found in humanist and serif types.</p>


                @import url('');

:root {
  --space: 0;

label {
  display: inline-block;
  font-family: monospace;
  text-transform: uppercase;
  line-height: 1;
  vertical-align: middle;
  font-weight: bold;

input {
  display: inline-block;
  margin: 0 0 0 0.5em;
  vertical-align: middle;

article {
  max-width: 75ex;
  margin: 2em 0 0 0;
  font-family: Roboto;

p {
  line-height: calc(1.4 + var(--space) / 100);
  letter-spacing: calc(1em * (var(--space) / 200));
  word-spacing: calc(1em * (var(--space) / 100));


                function increase(event) {'--space',;
document.getElementById('range').addEventListener('input', increase);