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              <button onclick="showNewtorkInformation();">Show Network Information</button>

<p class="message information"></p>

<p class="message error noAPI">
  You browser does not support <span>navigator.connection</span>

<p class="message error incompleteAPI">
  You browser has incomplete implementation of <span>navigator.connection</span>. Things like <span>navigator.connection.type</span> and <span>navigator.connection.downlinkMax</span> are used in this demo.
              .message {
  padding: 20px;
  line-height: 2;
  border: 1px solid #f2f2f2;
  display: none;
  &.error {
    border: 1px solid #e60000;
    background: #ffb3b3;
    color: #e60000;
  a {
    text-decoration: none;
    color: white;
    font-weight: bold;
  span {
    border: 1px solid white;
    border-radius: 5px;
    padding: 5px;
    background: #f2f2f2;

.show {
  display: block;

button {
  display: block;
  width: 50%;
  height: 50px;
  margin: 20px auto;
  background:  #99ff99;
  border: 1px solid #00e600;
  color: #008000;
  cursor: pointer;
              function showNewtorkInformation() {
  if(!navigator.connection) {

  if(!navigator.connection.type || !navigator.connection.downlinkMax) {
  let text = `
    Connection type as obtained from
    : ${navigator.connection.type}.
    Connection downlink as obtained from
    : ${navigator.connection.downlinkMax}.
    Connection effective type as obtained from
    : ${navigator.connection.effectiveType}.
    Connection RTT as obtained from
    : ${navigator.connection.rtt}.
      .innerHTML = text;
    // Handle Change in type or downlink information
      .addEventListener('change', showNewtorkInformation);

function showMessage(classname) {
Loading ..................