<div class="wrapper">
  <h3>The <code>trim()</code> method explained</h3>
  <input type="text" id="input" value="   Hello, World! " />
  <output id="output"></output>
</div>

<a id="read-more" href="">Read more</a>

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  display: grid;
  place-items: center;
  min-height: 100vh;

  font-family: system-ui, sans-serif;
  font-size: 1.5rem;
}

.wrapper {
  width: min(100% - 2rem, 25rem);
  display: grid;
  gap: 1rem;
}

h3 {
  margin: 0;
  font-size: 1.5rem;
  text-align: center;
}

input {
  font: inherit;
}

output {
  border-bottom: 1px solid #ccc;
}

#read-more {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: inline-block;
  padding: 0.25em 0.5em;
  font-size: 1rem;
  text-decoration: none;
  text-transform: capitalize;
  color: #fff;
  background-color: rgb(0, 100, 200);
  border-radius: 0.25em;
}

const inputEl = document.getElementById("input");
const outputEl = document.getElementById("output");

inputEl.addEventListener("input", (e) => {
  removeExtraSpace(inputEl.value, outputEl);
});

function removeExtraSpace(input, output) {
  output.innerText = input.trim();
}

removeExtraSpace(inputEl.value, outputEl);